Bigoted and enthusiastic about right in unrewarding time (10)
I believe the answer is:
intolerant
'bigoted' is the definition.
(similar in meaning)
'enthusiastic about right in unrewarding time' is the wordplay.
'enthusiastic about' becomes 'into' (into can mean interested in or enthusiastic about).
'right' becomes 'r' (common abbreviation).
'in' is an insertion indicator.
'unrewarding' becomes 'lean' (lean can mean offering very little).
'time' becomes 't' (abbreviation).
'r' going inside 'lean' is 'leran'.
'into'+'leran'+'t'='INTOLERANT'
'and' is the link.
(Other definitions for intolerant that I've seen before include "illiberal" , "Impatient" , "Bigoted" , "Hating" , "Lacking respect for the beliefs of others" .)