Bread of Heaven a novelty (3)
I believe the answer is:
nan
'bread' is the definition.
(variant spelling of naan)
'of heaven a novelty' is the wordplay.
'of' indicates the answer is hidden within the clue.
'NAN' can be found hidden inside 'heaven a novelty'.
(Other definitions for nan that I've seen before include "Relation" , "Darling dog" , "Grandmother (informal)" , "Indian bread; grandma" , "Grannie" .)