One composer introduces card game to another (10)
I believe the answer is:
monteverdi
'one composer' is the definition.
(Claudio Monteverdi, 1567-1643)
'card game to another' is the wordplay.
'card game' becomes 'monte' (monte is a kind of card game).
'to another' becomes 'verdi' (I can't explain this - if you can you should give a lot more credence to this answer).
'monte'+'verdi'='MONTEVERDI'
'introduces' is the link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for monteverdi that I've seen before include "One composer" , "Claudio --, 16th-17th century Italian composer" , "C Sixteen-Seventeen Italian composer (Orfeo)" , "Italian scorer" , "Composer of "Orpheus"" .)