Like one's flat number? (4)

I believe the answer is:

even

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'like' is the definition.
(thesaurus)

'one's flat number?' is the wordplay.
'one's flat' becomes 'eve' (I can't justify this - if you can you should believe this answer much more).
'number?' becomes 'n' (n can represent any number).
'eve'+'n'='EVEN'

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(Other definitions for even that I've seen before include "of consistent quality" , "Still - divisible by two" , "All square" , "Level as odds may be" , "Unvarying" .)

I've seen this clue in the Evening Standard.

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