Crossword Genius

Cleans up: as does autumnal gardener? (5,1,4)

Ross

I believe the answer is:

makes a pile

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

'does autumnal gardener?' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'cleans up' is the wordplay.
I cannot really see how this works, but
'cleans up' could be 'makes' (making is a kind of cleaning up) and 'makes' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

'as' acts as a link.

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.
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