| SPARKS | Radio operator from Flint? (6) |
| ARRGOSCATALOGUE | Weighty tome showing retailer's wares, according to Captain Flint? * (6,9) |
| SPEARHEAD | Lead - or sharpened flint? |
| FORT | Keep either end of flint? (4) |
| PLANER | In the hands of a smooth operator from Park Lane on one side of Westminster (6) |
| MAHOUT | Jumbo pilot turning radio operator away (6) |
| NEWHAM | Lately discovered radio operator in London borough (6) |
| HAMMER | Radio operator and setter gets right tool (6) |
| GRAHAM | He's a radio operator behind the king |
| EUROSTAR | Train operator from St Pancras to the continent (8) |
| SPARK | Particle flung from flint and steel |
| USER | Operator from American internet centre (4) |
| KNAP | To make stone tools from flint (4) |
| GONDOLIER | Boat operator from another old region (9) |
| STEEL | An alloy for striking sparks from flint; a sword; a tool for honing a knife; or, a bone, rod or stay for corsetry (5) |
| STONEAGE | Period of pre-history characterised by tools made from flint (5,3) |
| BREAKER | Wave from CB radio operator (7) |
| NOORINAYATKHAN | SOE agent, codename Madeleine, the first female radio operator to be sent into Nazi-occupied France (4,6,4) |
| HAM | Word for an amateur radio operator; an inexpert boxer; an excessively theatrical actor or thesp; the crooked back of a knee/thigh; a hog's hock; or, salted or smoked meat from said porcine part (3) |
| GREENHAMCOMMON | Young radio operator found often by site of anti-nuclear weapons protesters' camp (8,6) |
