He produces his pass when he's being charged (7)
I believe the answer is:
matador
'he's being charged' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he produces his pass' is the wordplay.
I cannot really see how this works, but
'he' could be 'mata' and 'mata' is located in the answer.
'pass' could be 'do' (doing is a kind of passing) and 'do' is found in the answer.
A single letter 'r' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'when' is the link.
Can you help me to learn more?
(Other definitions for matador that I've seen before include "he aims to get a bull" , "Beastly fighting man" , "Bullfighter who slays the bull" , "Performer in the Ring" , "who does for bulls" .)