Reject plate with large design (8)
I believe the answer is:
disclaim
'reject' is the definition.
(thesaurus)
'plate with large design' is the wordplay.
'plate' becomes 'disc' (disc is a kind of plate**).
'with' says to put letters next to each other.
'large' becomes 'l'.
'design' becomes 'aim' (I've seen this in other clues).
'disc'+'l'+'aim'='DISCLAIM'
(Other definitions for disclaim that I've seen before include "Renounce" , "Deny, refuse to acknowledge" , "Disown or deny, maybe responsibility" , "Deny or relinquish" , "Forswear" .)