Wicked thing loves going inside for kiss and cuddle (8)
I believe the answer is:
canoodle
'kiss and cuddle' is the definition.
(to canoodle is to kiss and cuddle)
'wicked thing loves going inside' is the wordplay.
'wicked thing' becomes 'candle' (something with a wick).
'loves' becomes 'oo' (two O's - 'love' means zero in tennis).
'going inside' indicates putting letters inside.
'candle' going around 'oo' is 'CANOODLE'.
'for' acts as a link.
(Other definitions for canoodle that I've seen before include "spoon" , "Behave amorously" , "Fondle" , "Hug and kiss" , "Pet" .)