Certificate; restriction (13)
I believe the answer is:
qualification
I believe this is a double definition.
'certificate' is the first definition.
(I've seen this before)
'restriction' is the second definition.
(thesaurus)
(Other definitions for qualification that I've seen before include "Diploma" , "evidence of capability?" , "Possibly a rider" , "Proviso" , "Relevant certificate" .)