Note on tax returned in pub (6)
I believe the answer is:
tavern
'pub' is the definition.
(I've seen this in another clue)
'note on tax returned' is the wordplay.
'note' becomes 'n' (abbreviation).
'on' becomes 're' ('on' can be mean 'with reference to').
'tax' becomes 'vat' (British sales tax).
'returned' says the letters should be written in reverse.
'n'+'re'+'vat'='nrevat'
'nrevat' back-to-front is 'TAVERN'.
'in' is the link.
(Other definitions for tavern that I've seen before include "An old inn or hostelry" , "where drink is available" , "An old inn, musically in the town" , "Old song: 'There is a ...... in the town, in the town'" , "Tap house" .)