Some estaminet takings may be after tax (4)
I believe the answer is:
nett
'after tax' is the definition.
(I've seen this before)
'some estaminet takings may' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'NETT' can be found hidden inside 'estaminet takings may'.
'be' acts as a link.
(Other definitions for nett that I've seen before include "cleared of all charges" , "Clear of deductions" , "Left after deductions" , "Free of tax" , "Pay" .)