A bounder, this captain? (7)
I believe the answer is:
skipper
'a bounder this captain?' is the definition.
'skipper' can be an answer for 'captain?' ('skipper' can be a synonym of 'captain'). I'm unsure of the remainder of the definition.
'a bounder this captain?' is the wordplay.
I cannot quite see how this works, but
'a' could be 'per' (eg 'one a day' means 'one per day') and 'per' is found in the answer.
'captain?' could be 'skip' (short for skipper) and 'skip' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for skipper that I've seen before include "Head" , "Chap aboard trawler" , "sea-captain" , "one that's put over the side" , "Senior pilot" .)