Bedlam at Eurovision entertains enthusiast (7)
I believe the answer is:
amateur
'enthusiast' is the definition.
(I've seen this before)
'bedlam at eurovision entertains' is the wordplay.
'entertains' says the answer is hidden in the clue (the answer is welcomed or entertained by the clue).
'AMATEUR' can be found hidden inside 'bedlam at eurovision'.
(Other definitions for amateur that I've seen before include "Unpaid (sportsman}" , "Of sportsman, not professional" , "enthusiast" , "inept player" , "11 [UNTRAINED]" .)