Relatively easy to smile coyly about learner driver (7)
I believe the answer is:
simpler
'relatively easy' is the definition.
(easy can mean simple or straightforward)
'smile coyly about learner driver' is the wordplay.
'smile coyly' becomes 'simper' (to simper is to smile in an exaggeratedly coy way).
'about' indicates putting letters inside.
'learner driver' becomes 'l' (I've seen this in other clues).
'simper' placed around 'l' is 'SIMPLER'.
'to' is the link.
(Other definitions for simpler that I've seen before include "Easier" , "Less complicated or complex" , "More easy" , "That wasn't so hard!)" .)