Huge salaries ultimately swallowed up by tax (4)
I believe the answer is:
vast
'huge' is the definition.
(I know that huge can be written as vast)
'salaries ultimately swallowed up by tax' is the wordplay.
'ultimately' says to take the final letters.
'swallowed' means one lot of letters goes inside another.
'up by tax' becomes 'vat' (I am not sure about this - if you are sure you should believe this answer much more).
The last letter of 'salaries' is 's'.
's' inserted within 'vat' is 'VAST'.
Can you help me to learn more?
(Other definitions for vast that I've seen before include "Boundless" , "Astronomical" , "Huge, enormous" , "Colossal" , "Unusually great" .)