Drive to discourage people on motorway (13)
I believe the answer is:
determination
'drive' is the definition.
(thesaurus)
'discourage people on motorway' is the wordplay.
'discourage' becomes 'deter' ('deter' can be a synonym of 'discourage').
'people' becomes 'nation'.
'on' says to put letters next to each other.
'motorway' becomes 'mi' (resembles M1, English motorway).
'nation' put after 'mi' is 'mination'.
'deter'+'mination'='DETERMINATION'
'to' is the link.
(Other definitions for determination that I've seen before include "Resoluteness" , "Willpower" , "24 [DRIVE]" , "Decision process" , "Resolution" .)