Quick holiday kiss? (9)
I believe the answer is:
breakneck
'quick' is the definition.
(thesaurus)
'holiday kiss?' is the wordplay.
'holiday' becomes 'break' (I've seen this before).
'kiss?' becomes 'neck' (kissing is a kind of necking).
'break'+'neck'='BREAKNECK'
(Other definitions for breakneck that I've seen before include "This speed is recklessly dangerous" , "rash" , "Dangerously fast" , "high speed" .)