Crossword Genius

Key man (or boys?) (5)

Ross

I believe the answer is:

allen

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'key man' is the definition.
'Allen' can be an answer for 'man'. I'm not sure about the 'key' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for allen that I've seen before include "Woody ..., US film maker" , "Woody ... is film director and comic actor" .)

I've seen this clue in the Evening Standard.
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