Less than generous, the support for Western child prodigy (10)
I believe the answer is:
wunderkind
'child prodigy' is the definition.
(I've seen this before)
'less than generous the support for western' is the wordplay.
'less than' becomes 'under' (I've seen this before).
'generous' becomes 'kind' (similar in meaning).
'the support for' says to put letters next to each other.
'western' becomes 'w'.
'under'+'kind'='underkind'
'underkind' after 'w' is 'WUNDERKIND'.
(Other definitions for wunderkind that I've seen before include "One having early success" , "Perhaps Mozart" , "Child prodigy" , "Extraordinary issue" , "Clever young person" .)