Student tucking into good French wine knocked back more white (7)

'more white' is the definition.
Both the definition and answer are comparative adjectives. Perhaps they are linked in a way I don't understand?

'student tucking into good french wine knocked back' is the wordplay.
'student' becomes 'l' (as in L-plates for learner drivers).
'tucking into' means one lot of letters goes inside another.
'good french' becomes 'bon' ('good' in French).
'wine' becomes 'red' (red is a type of wine).
'knocked back' is a reversal indicator.
'red' reversed gives 'der'.
'l' put inside 'bon' is 'blon'.
'blon'+'der'='BLONDER'

Can you help me to learn more?