Special honey extremely likely to be fragrant (6)
I believe the answer is:
smelly
'be fragrant' is the definition.
(thesaurus)
'special honey extremely likely' is the wordplay.
'special' becomes 's' (common abbreviation as in Special Air Service).
'honey' becomes 'mel' (I've seen this before).
'extremely' means to remove the middle letters.
'likely' with its centre taken out is 'ly'.
's'+'mel'+'ly'='SMELLY'
'to' is the link.
(Other definitions for smelly that I've seen before include "Malodorous" , "Foetid" , "Having a bad odour" , "Off - humming" , "Odorous" .)