Mostly skilful goal from champion (6)
I believe the answer is:
defend
'champion' is the definition.
('defend' can be a synonym of 'champion')
'mostly skilful goal' is the wordplay.
'mostly' means to remove the last letter.
'skilful' becomes 'deft' (I've seen this before).
'goal' becomes 'end' ('end' can be a synonym of 'goal').
'deft' with its final letter removed is 'def'.
'def'+'end'='DEFEND'
'from' is the link.
(Other definitions for defend that I've seen before include "Compete to retain (sporting title)" , "Guard against attack" , "Protect from harm" , "Act as a guard" , "Protect or assist against attack" .)