Artist forced into allowance (6)
I believe the answer is:
ration
'allowance' is the definition.
(thesaurus)
'artist forced into' is the wordplay.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'forced' indicates an anagram.
'into' anagrammed gives 'tion'.
'ra'+'tion'='RATION'
(Other definitions for ration that I've seen before include "Helping" , "Limit, share" , "Eke out" , "Limit issue" , "Restrict the supply of" .)