Good thread topic.
For mine, a list clogger is a player who:-
A/is youngish but hasn't devleoped enough over time (a reasonable amount of time unless there is a particular issue)
B/ is established in age and/or getting regular senior games but can't further improve as a player or us as a club.
So in this first bracket I would put:-
Dea, Batchelor, possibly Arnott
In the second bracket it's a bit easier (to me):-
Foley, Newman, Grigg, Thomas, Pettard (play well at times. It believe we could devleoped our own in his role), Knights (injuries) and Hampson