Group of players the French keep together (6)
I believe the answer is:
castle
'keep together' is the definition.
'castle' can be an answer for 'keep' (I've seen this before). I'm not sure about the 'together' bit.
'group of players the french' is the wordplay.
'group of players' becomes 'cast' (I've seen this in another clue).
'the french' becomes 'le' ('the' in French).
'cast'+'le'='CASTLE'
Can you help me to learn more?
(Other definitions for castle that I've seen before include "''An Englishman's home is his . . .''" , "Lincoln, Ludlow or Leeds" , "Fortified place on the chess board" , "Chess piece and fortified building" , "old building?" .)