Team players act with calm, mainly working out (7,6)
I believe the answer is:
crystal palace
'team' is the definition.
(football team)
'players act with calm mainly working out' is the wordplay.
'with' says to put letters next to each other.
'mainly' means to remove the last letter (virtually or mainly the word, but not all of it).
'working out' is an anagram indicator (an anagram must be worked out from the letters).
'calm' with its final letter removed is 'cal'.
'players'+'act'='playersact'
'playersact' after 'cal' is 'calplayersact'.
'calplayersact' is an anagram of 'CRYSTAL PALACE'.
(Other definitions for crystal palace that I've seen before include "In the glasshouse" , "Joseph Paxton's 1851 creation" , "Area of S. London" , "they play ball" , "London football club" .)