Negligent match official ignoring last fumble (6)
I believe the answer is:
remiss
'negligent' is the definition.
(similar in meaning)
'official ignoring last fumble' is the wordplay.
'official' becomes 'ref' (match official in football, say).
'ignoring last' means to remove the last letter.
'fumble' becomes 'miss' (fumble can mean to miss or drop).
'ref' with its last letter removed is 're'.
're'+'miss'='REMISS'
'match' is the link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for remiss that I've seen before include "delinquent" , "Negligent, slack" , "At fault" , "Failing in one's duty" , "Negligent in performing duties" .)