Heavenly food (5)

I believe the answer is:

manna

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'heavenly food' is the definition.
(as in manna from heaven)

'heavenly food' is the wordplay.
'heavenly' becomes 'mann' (I can't explain this - if you can you should believe this answer much more).
'food' becomes 'A' (A is an example).
'mann'+'a'='MANNA'

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(Other definitions for manna that I've seen before include "Old Testament food (from heaven?)" , "Sweet gum; an unexpected benefit" , "wonderful food" , "Spiritual nourishment" , "Heavenly grub?" .)

I've seen this clue in The Star Tribune, the King Feature Syndicate and The Globe and Mail.

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