Men at test making declaration (9)
I believe the answer is:
statement
'declaration' is the definition.
(I've seen this before)
'men at test making' is the wordplay.
'making' indicates an anagram.
'men'+'at'+'test'='menattest'
'menattest' is an anagram of 'STATEMENT'.
(Other definitions for statement that I've seen before include "Bank account record" , "What bank provides" , "Announcement, issued by the bank say" , "relation" , "Bank account document" .)