Stray with a condition (4)

I believe the answer is:

waif

'stray' is the definition.
(thesaurus)

'with a condition' is the wordplay.
'with' becomes 'w' (abbreviation).
'condition' becomes 'if' (I've seen this in other clues).
'w'+'a'+'if'='WAIF'

(Other definitions for waif that I've seen before include "Gamin" , "Homeless child - thin person" , "Be incongruous" , "Ragamuffin" , "Orphan" .)

I've seen this clue in The Telegraph.

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