In one short month, we do a clean job (5)

I believe the answer is:

sweep

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'do a clean job' is the definition.
'sweep' can be an answer for 'do' (thesaurus). I'm unsure of the 'a clean job' bit.

'in one short month we' is the wordplay.
'in' is an insertion indicator.
'one short month' becomes 'Sep' (abbreviation for September; 'short' suggests a short form).
'sep' enclosing 'we' is 'SWEEP'.

Can you help me to learn more?

(Other definitions for sweep that I've seen before include "a puppet" , "Expanse" , "do cleaning" , "pass swiftly" , "gambling event" .)

I've seen this clue in the Evening Standard.

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