Track crossing Virginia, hard work (7)
I believe the answer is:
travail
'hard work' is the definition.
(travail can mean hard work or effort)
'track crossing virginia' is the wordplay.
'track' becomes 'trail' (synonyms).
'crossing' indicates putting letters inside.
'virginia' becomes 'va' (US state abbreviation).
'trail' placed around 'va' is 'TRAVAIL'.
(Other definitions for travail that I've seen before include "Hard work" , "Labour, toil" , "Toil - anguish" , "Hard labour" , "painful exercise" .)