Honey in sugary centre (10)
I believe the answer is:
sweetheart
'honey' is the definition.
(I've seen this in another clue)
'sugary centre' is the wordplay.
'sugary' becomes 'sweet' (associated in meaning).
'centre' becomes 'heart' (synonyms).
'sweet'+'heart'='SWEETHEART'
'in' acts as a link.
(Other definitions for sweetheart that I've seen before include "Boy- or girlfriend" , "boyfriend?" , "flame?" , "Steady!" , "Love" .)