Key man (or boys?) (5)
I believe the answer is:
allen
'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" .)