Crossword Genius

Where heaps could be made flabby? (3,2,5)

Ross

I believe the answer is:

out of shape

I'm a little stuck... Click here to teach me more about this clue!

'flabby?' is the definition.
(I've seen this in another clue)

'where heaps' is the wordplay.
I cannot really understand how this works, but
an anagram of 'heaps' is 'shape' which is present in the answer.
The remaining letters 'outof' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'could be made' is the link.

Can you help me to learn more?

(Other definitions for out of shape that I've seen before include "Whence military orders may come" , "Not fit" , "in poor condition" , "Unhealthy" , "Unfit" .)

I've seen this clue in The Guardian.
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