Full of promise, bowled straight (6)
I believe the answer is:
bright
'full of promise' is the definition.
(thesaurus)
'bowled straight' is the wordplay.
'bowled' becomes 'b' (cricket abbreviation).
'straight' becomes 'right' ('right' can be a synonym of 'straight').
'b'+'right'='BRIGHT'
(Other definitions for bright that I've seen before include "economist" , "supporter of free trade" , "Illuminated" , "Clever; vivid" , "Vivid; cheerfully lively" .)