Crossword Genius

Acknowledgment hard bread must be sent back (3,3)

Ross

I believe the answer is:

hat tip

'acknowledgment' is the definition.
(a hat tip is an acknowledgment of someone)

'hard bread must be sent back' is the wordplay.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'bread' becomes 'pitta' (I've seen this before).
'must be sent back' is a reversal indicator.
'pitta' reversed gives 'attip'.
'h'+'attip'='HAT TIP'

I've seen this clue in The Times.
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