Good learner, outstanding and bright (7)
I believe the answer is:
glowing
'bright' is the definition.
('glowing' can be similar in meaning to 'bright')
'good learner outstanding' is the wordplay.
'good' becomes 'g' (abbreviation).
'learner' becomes 'l'.
'outstanding' becomes 'owing' ('owing' can be a synonym of 'outstanding').
'g'+'l'+'owing'='GLOWING'
'and' is the link.
(Other definitions for glowing that I've seen before include "Giving out steady light" , "full of praise" , "Incandescent" , "Radiant" , "Complimentary" .)