Bit of a gamble for cigarette (3)
I believe the answer is:
fag
'cigarette' is the definition.
(synonyms)
'bit of a gamble' is the wordplay.
'bit' says the answer is hidden in the clue (I've seen 'bit of' mean this).
'FAG' can be found hidden inside 'of a gamble'.
'for' acts as a link.
(Other definitions for fag that I've seen before include "Tiring task; cigarette" , "Boring task" , "Cigarette for a menial schoolboy" , "He'll do anything you ask" , "an awful bore!" .)