| TWOCANPLAY | Retaliatory principle that applies to surrounding solutions (3,3,4,2,4,4) |
| ATTHATGAME | Retaliatory principle that applies to surrounding solutions (3,3,4,2,4,4) |
| REDUCTIOADABSUR | Logical principle that applies to 17-, 27- and 48-Across, aptly |
| BASE | Form of a noun, pronoun or adjective that indicates its semantic relation to surrounding words ( 4) |
| CONTEXTUAL | Relating to surrounding words |
| OPPOSITESATTRACT | Maxim that applies to pairs hiding together in the answers to starred clues |
| HOUSERULE | A rule that applies to a place or group |
| ROUTINE | A rule that applies to a place or group |
| RULESANDREGULATIONS | A rule that applies to a place or group |
| STANDINGORDER | A rule that applies to a place or group |
| REP | Abbr. that applies to Dennis Hastert in two ways |
| BACKSTOP | Position that applies to across clue after 90-degree rotation? (8) |
| RETROSPECTIVELY | In a way that applies to past events (15) |
| ACROSSTHEBOARD | Directors pursuing a sign that applies to all |
| SAMEHERE | That applies to me too (4,4) |
| FASTLANE | Tenor starts old training programme with track that applies to those with a hectic lifestyle (4,4) |
| HOLISTIC | The sort of medical practice that applies hydrogen to bad colitis (8) |
| IMPASTO | Painting that applies the pigment thickly so that brush or palette knife marks are visible. |
| PLATEN | Part of a printing press that applies pressure to the paper and type; or, a roller in a typewriter (6) |
| DEFIBRILLATOR | Apparatus that applies an electric current to the chest wall or heart (13) |
