Stick to (6)
'stick to' is the definition.
(synonyms)
This is all the clue.
(Other definitions for adhere that I've seen before include "paste" , "Remain attached" , "Stick like a stamp" , "Hold fast, stand by" , "Stick to - cement" .)
'stick to' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cling that I've seen before include "Be emotionally over-dependent" , "Hold tightly, become attached" , "act like limpets" , "Stick - tinkle" , "Hold, cleave" .)