Handle isn't working with frame (5,4)

I believe the answer is:

first name

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'handle' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'isn't working with frame' is the wordplay.
'working with' indicates an anagram (working with the letters).
'isnt' anagrammed with 'frame' makes 'FIRST NAME'.

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I've seen this clue in The Times.

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