Crossword Genius

I am after tax (6)

Ross

I believe the answer is:

impost

'tax' is the definition.
(impost is a kind of tax)

'i am after' is the wordplay.
'i am' becomes 'im'.
'after' becomes 'post' (I've seen this before).
'im'+'post'='IMPOST'

(Other definitions for impost that I've seen before include "Customs duty" , "A tax or duty levied" .)

I've seen this clue in The Telegraph.
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