Developing remit as experts (7)
I believe the answer is:
maestri
'experts' is the definition.
(I've seen this before)
'developing remit as' is the wordplay.
'developing' indicates an anagram.
'remit'+'as'='remitas'
'remitas' is an anagram of 'MAESTRI'.
(Other definitions for maestri that I've seen before include "Distinguished musicians" , "Experts" , "Top musicians" , "Top conductors" , "Eminent musical conductors" .)