News agency ring for request (6)
I believe the answer is:
appeal
'for request' is the definition.
(appeal is a kind of request)
'news agency ring' is the wordplay.
'news agency' becomes 'AP'.
'ring' becomes 'peal' (synonyms).
'ap'+'peal'='APPEAL'
(Other definitions for appeal that I've seen before include "Ask earnestly" , "A crustacean" , "fetching" , "attract one's interest" , "Entreat, plead" .)