Polish match official in trouble ultimately (6)
I believe the answer is:
refine
'polish match' is the definition.
'refine' can be an answer for 'polish' ('refine' can be a synonym of 'polish'). I am unsure of the 'match' bit.
'official in trouble ultimately' is the wordplay.
'official' becomes 'ref' (match official in football, say).
'ultimately' says to take the final letters.
The last letter of 'trouble' is 'e'.
'ref'+'in'+'e'='REFINE'
Can you help me to learn more?
(Other definitions for refine that I've seen before include "Make pure" , "Remove impurities as from oil" , "Remove impurities or make cultured" , "Purify or make more cultured" , "Cleanse from impurities" .)