Ask a page to put on ring (6)
I believe the answer is:
appeal
'ask' is the definition.
(I know that appeal is a more specific form of the action challenge)
'a page to put on ring' is the wordplay.
'page' becomes 'p'.
'to put on' says to put letters next to each other (some letters go on or after others).
'ring' becomes 'peal' (pealing is a kind of ringing).
'a'+'p'+'peal'='APPEAL'
(Other definitions for appeal that I've seen before include "attract one's interest" , "Supplication to take a higher court" , "Bring verdict for review by higher court" , "Seek reversal of verdict from higher court" , "Claim - fascination" .)