Hoot when swerving a lot passing leader in panic – crash still? (9)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

A charade of P (‘leader in P anic’) plus HOTO, an anagram (‘when swerving’) of ‘hoot’ plus BOMB (‘a lot’ in price). To PHOTOBOMB is to appear unwelcomely in a ‘still’ taken for another purpose.