A foreign composer to solve mystery (7)
I believe the answer is:
unravel
'solve mystery' is the definition.
'unravel' can be an answer for 'solve' (I've seen this in another clue). I'm not sure about the 'mystery' bit.
'a foreign composer' is the wordplay.
'a foreign' becomes 'un' ('a' translated into French).
'composer' becomes 'Ravel' (Maurice Ravel).
'un'+'ravel'='UNRAVEL'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for unravel that I've seen before include "Disentangle knitted wool or solve mystery" , "Become undone" , "Disentangle or undo like knitted fabric" , "Solve the problem" , "Undo; begin to collapse" .)