Novice competitor (7)
I believe the answer is:
entrant
I believe this is a double definition.
'novice' is the first definition.
(I know that entrant is a type of novice)
'competitor' is the second definition.
(someone who has entered a competition)
(Other definitions for entrant that I've seen before include "One going in for something" , "New member or competitor" , "Someone signing up for a competition" , "Someone coming in" , "Participant in competition" .)