Rubbish match official regularly guesses (6)
I believe the answer is:
refuse
'rubbish match' is the definition.
'refuse' can be an answer for 'rubbish' (both can mean waste material). I'm not certain of the 'match' bit.
'official regularly guesses' is the wordplay.
'official' becomes 'ref' (match official in football, say).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternating letters of 'guesses' are 'use'.
'ref'+'use'='REFUSE'
Can you help me to learn more?
(Other definitions for refuse that I've seen before include "Junk" , "Say no to - waste" , "Decline to accept garbage" , "Turn down - rubbish" , "Decline to accept - rubbish" .)