Repeat concerning request (10)
I believe the answer is:
repetition
'repeat' is the definition.
(synonyms)
'concerning request' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'request' becomes 'petition' (petition is a kind of request).
're'+'petition'='REPETITION'
(Other definitions for repetition that I've seen before include "saying again and again!" , "It may result in another hearing" , "that offers nothing new?" , "Reiteration" .)