. . . while a wool-grower is a musketeer (6)
I believe the answer is:
aramis
'is a musketeer' is the definition.
(I've seen this in another clue)
'while a wool-grower' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
The remaining letters 'ramis' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for aramis that I've seen before include "One Musketeer" , "Fictional musketeer" , "Literary musketeer" , "One of Dumas' three musketeers" , "One of Dumas's Musketeers" .)