On the subject of tie, match fixed! (8)
I believe the answer is:
thematic
'on the subject' is the definition.
I can't judge whether this defines the answer.
'tie match fixed' is the wordplay.
'fixed' indicates an anagram.
'tie'+'match'='tiematch'
'tiematch' is an anagram of 'THEMATIC'.
'of' is the link.
Can you help me to learn more?
(Other definitions for thematic that I've seen before include "relevant to subject" , "Related to a particular subject" , "Topical" , "Relating to a particular subject" , "Relating to a particular topic" .)