Sugary centre, honey (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'
(Other definitions for sweetheart that I've seen before include "Steady!" , "Darlin'"" , "Dear" , "Darling" , "Love" .)