Heap in the highest acknowledgements (5)

I believe the answer is:

stack

'heap' is the definition.
(stack is a kind of heap)

'in the highest acknowledgements' is the wordplay.
'in' says the answer is hidden in the clue.
'STACK' is hidden in the letters of 'highest acknowledgements'.

(Other definitions for stack that I've seen before include "Tall chimney" , "A lot" , "functioned successfully in Scotland" , "Place in ordered pile" , "Piled heap" .)

I've seen this clue in the Sydney Morning Herald.

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