Dishonesty of tie-up shown after a month (6)
I believe the answer is:
deceit
'dishonesty' is the definition.
(deceit is a kind of dishonesty)
'tie-up shown after a month' is the wordplay.
I cannot really understand how this works, but
an anagram of 'tie' is 'eit' which is within the answer.
'month' could be 'dec' (abbreviation for December) and 'dec' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for deceit that I've seen before include "Fraud, falsity" , "fake" , "Chicanery" , "Subterfuge" , "Falsehood" .)