Agrees the competition is dishonest (8)
I believe the answer is:
complies
'agrees' is the definition.
(complying is a kind of agreeing)
'competition is dishonest' is the wordplay.
'competition' becomes 'comp' (I've seen this in other clues).
'is dishonest' becomes 'lies' (to lie is to be dishonest).
'comp'+'lies'='COMPLIES'
'the' is the link.
(Other definitions for complies that I've seen before include "Abides by, follows rules" , "Agrees" .)