Tack will get upset after tax is taken dishonestly (3-6)
I believe the answer is:
ill-gotten
'taken dishonestly' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives occasionally define each other.
'tack will get upset after tax' is the wordplay.
'tack will' becomes 'illgot' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'get upset' says the letters should be written in reverse (I've seen 'getting upset' mean this).
'after tax' becomes 'net' (as in net profits).
'net' backwards is 'ten'.
'illgot'+'ten'='ILL-GOTTEN'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for ill-gotten that I've seen before include "Acquired by unworthy means" , "These gains are dishonestly come by" , "Procured by evil means" , "These gains are obtained by unlawful means" , "Obtained unjustly" .)