Poorly Grace gets fresh air in the vehicle (8)
I believe the answer is:
carriage
'the vehicle' is the definition.
(carriage is a kind of vehicle)
'poorly grace gets fresh air' is the wordplay.
'poorly' indicates an anagram (a poor spelling).
'gets' is an insertion indicator (gets can mean captures or absorbs).
'fresh' indicates anagramming the letters (a fresh re-ordering of the letters).
'grace' is an anagram of 'carge'.
'air' is an anagram of 'ria'.
'carge' enclosing 'ria' is 'CARRIAGE'.
'in' is the link.
(Other definitions for carriage that I've seen before include "Bearing; part of train" , "Conveyance, its cost" , "Bearing, deportment" , "Railway passenger coach" , "Railway vehicle" .)