Left a woman at Leatherhead - flat! (5)

I believe the answer is:

level

'flat' is the definition.
(I know that flat can be written as level)

'left a woman at leatherhead' is the wordplay.
'left' becomes 'L' (common abbreviation).
'a woman' becomes 'eve' (Eve is an example).
'at' means one lot of letters go next to another.
'leatherhead' becomes 'l' (head letter of 'leather').
'l'+'eve'+'l'='LEVEL'

(Other definitions for level that I've seen before include "Floor; surveying device" , "Horizontal line" , "Steady, flat, floor" , "Having a flat, horizontal surface" , "Flat, even" .)

I've seen this clue in the Evening Standard.

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