Solution – “DON’T STOP ME NOW” by Nimrod

Celebrating CAM’s milestone, the thematic answer is 4dn TON-UP. (a) As suggested by other fast things in Queen’s “Don’t Stop Me Now”, the perimeter reads GREASED LIGHTNING, A BAT OUT OF HELL, THE CLAPPERS, THE WIND; (b) TON is put UP in TON-UP, UNDERTONE, DETONATED, PITONS and CANTON; (c) CENTURY and FASHION, synonyms of TON, are put UP in the final grid, and highlighted.

Winner: Rachel Omotani (Girton 1967)
Runners-up: Charles Reid-Dick (St John’s 1969) and Bernard Banks (Trinity 1970)