Cut being painful, get on computer to cancel golf (10)
I believe the answer is:
tenderloin
'cut' is the definition.
(I know that tenderloin is a type of fillet)
'painful get on computer to cancel golf' is the wordplay.
'painful' becomes 'tender' (similar in meaning).
'get on computer' becomes 'log in' (as in logging in to a computer).
'to cancel' indicates named letters should be taken away.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'login' with 'g' removed is 'loin'.
'tender'+'loin'='TENDERLOIN'
'being' is the link.
(Other definitions for tenderloin that I've seen before include "Prime cut of pork, etc" , "best cut" , "Joint" , "Fine cut of meat" , "high crime rate here" .)