Student worker supports girl, being chivalrous (7)
I believe the answer is:
gallant
'chivalrous' is the definition.
('gallant' can be a synonym of 'chivalrous')
'student worker supports girl' is the wordplay.
'student' becomes 'l' (as in L-plates for learner drivers).
'worker' becomes 'ant' (worker is a type of ant).
'supports' says to put letters next to each other (bottom letters provide a support for the top ones).
'girl' becomes 'gal' ('gal' can be a synonym of 'girl'**).
'l'+'ant'='lant'
'lant' after 'gal' is 'GALLANT'.
'being' is the link.
(Other definitions for gallant that I've seen before include "Charmingly attentive to ladies" , "lady-killer?" , "Flirt" , "Honourable - chivalrous - suitor" , "markedly attentive to women" .)