| MAINDIAGONAL | Term in linear algebra for the series of entries in a square matrix extending from the top-left corner to the bottom-right corner |
| TRACE | Ground plan of a fortification; an amount of rain too small to be measured; the sum of the diagonal elements of a square matrix; or, a line marked by a recording instrument (5) |
| PLECTRON | Pet left corn flakes - plucky little thing |
| LIST | Series of entries |
| ADJOINT | Square matrix, in math |
| LOSING | Becoming angry or a hint to the pairs of entries in rows 3,5 and 10 |
| MATRICES | Arrays of numbers in linear algebra class |
| ZEROMATRIX | Empty set in linear algebra |
| MATRIX | Array in linear algebra |
| VISTA | View third of entries in travel document (5) |
| GRANDTOUR | Collective name for the series of three professional road cycle races including the Giro d'Italia and Vuelta a Espana (5,4) |
| TIROS | Abbreviation for the series of television and infrared observation meteorological satellites launched by the U.S. starting in 1960. (5) |
| HENRIAD | Nickname for the series of Shakespeare plays that portray the reign of Prince Hal |
| KAROO | Name for the series of arid plateaux occurring in parts of South Africa (5) |
| MONTGOMERY | L. M. ___, Canadian author best known for the series of novels beginning with 1908's Anne of Green Gables (10) |
| ODI | The format of cricket in which KL Rahul was recently named the captain for the series against South Africa. (abbvr) |
| KEEP | Write regular entries in (a diary); own or look after (an animal or shop); the cost of clothes, food and other essentials for living; or, a donjon (4) |
| GREECE | Country known for its blue and white flag, with a white cross on a blue background in the top left corner, and nine alternating stripes of blue and white |
| IVORTHEENGINE | Children's TV series, using cutout animation, about a locomotive who lives in the 'top left-hand corner of Wales' |
| SONGCONTEST | In which, from a lot of entries, a good number will be successful? (4,7) |
