Kiss and cuddle old drunk in boat (8)
I believe the answer is:
canoodle
'kiss and cuddle' is the definition.
(to canoodle is to kiss and cuddle)
'old drunk in boat' is the wordplay.
'drunk' is an anagram indicator.
'in' is an insertion indicator.
'boat' becomes 'canoe' (canoe is a kind of boat).
'old' anagrammed gives 'odl'.
'odl' placed within 'canoe' is 'CANOODLE'.
(Other definitions for canoodle that I've seen before include "Kiss and cuddle (informal)" , "neck" , "Behave amorously" , "Hug and kiss" , "spoon" .)