Declare old request (7)
I believe the answer is:
exclaim
'declare' is the definition.
(I know that exclaim is a more specific form of the action declare)
'old request' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'request' becomes 'claim' (claiming is a kind of requesting).
'ex'+'claim'='EXCLAIM'
(Other definitions for exclaim that I've seen before include "Shout out" , "Cry out in surprise, horror etc" , "speak out boldly" , "Express surprise" , "Speak sharply" .)