Small second soccer team around end of October regressed, becoming flabby (9)
I believe the answer is:
nerveless
'flabby' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
(Other definitions for nerveless that I've seen before include "Showing calm self-control" , "Having great confidence" , "Feeble" , "no feeling" , "Without fear" .)