Mad spoil at play for such certificates (8)
I believe the answer is:
diplomas
'certificates' is the definition.
(diploma is a kind of certificate)
'mad spoil at play' is the wordplay.
'at play' indicates an anagram (I've seen this in other clues).
'mad'+'spoil'='madspoil'
'madspoil' with letters rearranged gives 'DIPLOMAS'.
'for such' is the link.
(Other definitions for diplomas that I've seen before include "Written records of achievements" , "Certificates of passing examinations" , "Qualifications" , "Certificates of examinations passed" .)