Shelf further back hides confection (7)
I believe the answer is:
truffle
'confection' is the definition.
(truffle is a kind of confection)
'shelf further back hides' is the wordplay.
'hides' says the answer is hidden in the clue.
'back' says the letters should be written backwards.
'elffurt' is hidden within 'shelf further'.
'elffurt' back-to-front is 'TRUFFLE'.
(Other definitions for truffle that I've seen before include "Edible fungus -- chocolate sweet" , "Underground delicacy" , "Sweet - edible fungus growing underground" , "Fungus, a delicacy" , "2 (anag)" .)