Company way out with tax (4)
I believe the answer is:
scot
'tax' is the definition.
(thesaurus)
'company way out' is the wordplay.
'company' becomes 'co' (abbreviation).
'way' becomes 'st'.
'out' means one lot of letters goes inside another.
'co' inserted into 'st' is 'SCOT'.
'with' acts as a link.
(Other definitions for scot that I've seen before include "British northerner" , "Payment" , "Aberdonian possibly" , "Tax, Glasgow native" , "Someone from north of the border?" .)