Radio Times #9

[Midnighter]

21D Offensive people using silly hats at first

P?S?

The 'at first' in the clue makes me think the initial letters give the answer PUSH, but running it through a couple of crossword sites suggests PEST. Which is right?

[Lie-in King]

Push - 'p(eople) u(sing) s(illy) h(ats)' (at first)

[barry1010]

Push

 

[Midnighter]

Thanks.

[newmodarmy]

Agreed, it has to be that- and I assume offensive= push as in warfare