Can get many thanks for composition (7)
I believe the answer is:
cantata
'for composition' is the definition.
(I've seen this before)
'can get many thanks' is the wordplay.
'get' means one lot of letters go next to another.
'many thanks' becomes 'tata' (I can't explain this - if you can you should believe this answer much more).
'can'+'tata'='CANTATA'
Can you help me to learn more?
(Other definitions for cantata that I've seen before include "musical form?" , "Work for voice(s) and orchestra" , "piece of music" , "Choral item" , "Vocal composition" .)