Joe gets back in the car for a smoke (5)
I believe the answer is:
cigar
'a smoke' is the definition.
(I've seen this before)
'joe gets back in the car' is the wordplay.
'joe' becomes 'gi' (GI Joe).
'gets back' is a reversal indicator (I've seen 'got back' mean this).
'in' means one lot of letters goes inside another.
'gi' reversed gives 'ig'.
'ig' placed within 'car' is 'CIGAR'.
'for' is the link.
(Other definitions for cigar that I've seen before include "Rolled tobacco leaf for smoking" , "Roll of tobacco leaves for smoking" , "Something to smoke" , "Eg, a cheroot" , "Smoked item" .)