Prodigy being learner in motorway chase (7)
I believe the answer is:
miracle
'prodigy' is the definition.
(thesaurus)
'learner in motorway chase' is the wordplay.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'in' indicates putting letters inside.
'motorway' becomes 'MI' (resembles M1, English motorway).
'chase' becomes 'race' (both can mean to run fast).
'mi'+'race'='mirace'
'l' put into 'mirace' is 'MIRACLE'.
'being' is the link.
(Other definitions for miracle that I've seen before include "something amazing" , "Wonder, sign" , "Remarkable and welcome event" , "Divinely-inspired event" , "Reclaim (anag) - supernatural act" .)