Elevenses, though it's not quite eleven (3)
I believe the answer is:
tea
'elevenses' is the definition.
(I've seen this before)
'it's not quite eleven' is the wordplay.
'it's not quite' means to remove the last letter (most but not all of the word).
'eleven' becomes 'team' (eleven or XI can mean a football team).
'team' with its final letter taken away is 'TEA'.
'though' acts as a link.
(Other definitions for tea that I've seen before include "Char" , "Assam or Darjeeling, for example" , "Darjeeling, e.g." , "Light afternoon repast" , "grass" .)