Excellent and extremely delectable adviser (4)
I believe the answer is:
aide
'adviser' is the definition.
'excellent and extremely delectable' is the wordplay.
'excellent' becomes 'ai' (resembles 'A1', old-fashioned term for excellent).
'and' is a charade indicator (letters next to each other).
'extremely' suggests removing the centre (only the extremes of the word are used).
'delectable' with its middle taken out is 'de'.
'ai'+'de'='AIDE'
(Other definitions for aide that I've seen before include "Personal assistant in the military" , "Adviser or assistant" , "One to assist" , "Right-hand man/woman" , "Idea (anag)" .)