Skill shown in using foil (13)
I believe the answer is:
swordsmanship
'skill' is the definition.
(I know that swordsmanship is a type of skill)
'in using foil' is the wordplay.
I cannot quite understand how this works, but
'in' could be 'hip' (both can mean fashionable) and 'hip' is found in the answer.
'foil' could be 'sword' (I've seen this before) and 'sword' is found in the answer.
This explanation may well be incorrect...
'shown' acts as a link.
Can you help me to learn more?
(Other definitions for swordsmanship that I've seen before include "Skill with a blade" , "Skill at fencing" .)