Resembling a counterpart (5)

I believe the answer is:

alike

'resembling' is the definition.
(thesaurus)

'a counterpart' is the wordplay.
'counterpart' becomes 'like' (I've seen this in another clue).
'a'+'like'='ALIKE'

(Other definitions for alike that I've seen before include "Resembling each other" , "Equally" , "In a similar way" , "possessing similar characteristics" , "Comparable or similar" .)

I've seen this clue in The Mirror.

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