He definitely likes what's left over (5)

I believe the answer is:

lover

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'he definitely likes' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'left over' is the wordplay.
'left' becomes 'l' (common abbreviation).
'l'+'over'='LOVER'

'what's' acts as a link.

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(Other definitions for lover that I've seen before include "Juliet, for example" , "Lothario" , "fan" , "Swain" , "One has favourite" .)

I've seen this clue in the Evening Standard.

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