Cuddle up (6)
I believe the answer is:
nestle
'cuddle up' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nestle that I've seen before include "Settle snugly (within)" , "Settle comfortably (against something)" , "Cuddle, curl up" , "Lie in a sheltered position" , "Chocolate maker" .)