Dismiss half of London football team for contents of bag (7)
I believe the answer is:
sackful
'contents of bag' is the definition.
(contents of a bag or sack)
'dismiss half of london football team' is the wordplay.
'dismiss' becomes 'sack' (synonyms).
'half of' means to take half the letters.
'london football team' becomes 'fulham' (I've seen this before).
'fulham' halved is 'ful'.
'sack'+'ful'='SACKFUL'
'for' acts as a link.
(Other definitions for sackful that I've seen before include "Measured amount in large bag" , "Quantity held in large bag" , "Contents of large bag" .)