Players' lively movement (7)
I believe the answer is:
stretch
This clue is a triple definition!
'players'' is the first definition.
(I know that Stretch has the occupation rapper)
'lively' is the second definition.
(thesaurus)
'movement' is the third definition.
(I know that stretch is a type of movement)
(Other definitions for stretch that I've seen before include "Straighten the arms" , "Tax" , "Make demands on; lengthen" , "sort of limousine" , "Lengthen - time in jail" .)