Crossword Genius

Vocal pair behind the auditor’s payment guarantee gets a rough shed (4,2)

Ross

I believe the answer is:

lean to

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

'shed' is the definition.
(I've seen this before)

'vocal pair behind the auditor's payment guarantee gets a rough' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is found in the answer.
The remaining letters 'leto' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for lean to that I've seen before include "type of shed" , "outbuilding" , "shelter" , "conservatory, maybe" , "building" .)

I've seen this clue in The Hindu.
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