Squeal, excitedly, participating in matches? (6)
I believe the answer is:
equals
'participating in matches?' is the definition.
'equals' can be an answer for 'matches?' ('equal' can be a synonym of 'match'). I'm not certain of the 'participating in' bit.
'squeal excitedly' is the wordplay.
'excitedly' indicates an anagram (letters excited or stimulated into a new form).
'squeal' with letters rearranged gives 'EQUALS'.
Can you help me to learn more?
(Other definitions for equals that I've seen before include "sign" , "Peer group" , "Peers, matches" , "Is as good as" , "Those with the same status, rights, etc." .)