At the end of April, the woman left the flat (5)

I believe the answer is:

level

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

'at the end of april the woman left' is the wordplay.
'at the end of' says to take the final letters.
'the woman' becomes 'leve' (I can't explain this - if you can you should believe this answer much more).
'left' is a reversal indicator.
The final letter of 'april' is 'l'.
'leve' in reverse letter order is 'evel'.
'l'+'evel'='LEVEL'

Can you help me to learn more?

(Other definitions for level that I've seen before include "Floor; horizontal" , "Balanced" , "Neck and neck" , "Horizontal line" , "Palindromically smooth" .)

I've seen this clue in the Evening Standard.

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