Article regarding tax returns for Greek restaurant (7)
I believe the answer is:
taverna
'greek restaurant' is the definition.
(I've seen this before)
'article regarding tax returns' is the wordplay.
'article' becomes 'an' (indefinite article).
'regarding' becomes 're'.
'tax' becomes 'vat' (British sales tax).
'returns' says the letters should be written in reverse.
'an'+'re'+'vat'='anrevat'
'anrevat' in reverse letter order is 'TAVERNA'.
'for' is the link.
(Other definitions for taverna that I've seen before include "Greek inn" , "pub" , "Greek guesthouse" , "Greek bar/restaurant" , "Small Greek restaurant with bar" .)