Disheartened Ezekiel quits team (6)
I believe the answer is:
eleven
'team' is the definition.
(I know that eleven is a type of team)
'disheartened ezekiel quits' is the wordplay.
'disheartened' means to remove the middle letters (the middle or heart is removed).
'quits' becomes 'even' (as in 'call it quits').
'ezekiel' with its middle removed is 'el'.
'el'+'even'='ELEVEN'
(Other definitions for eleven that I've seen before include "Bingo's "legs"?" , "football team, for example" , "Cardinal" , "'Legs' bingo number" , "Number killed in the Peterloo massacre" .)