Offer made in local Post Office in Russian too: why translated? (5,4,6)
I believe the answer is:
whats your poison
'offer made in local' is the definition.
(question asked in a pub)
'post office in russian too why translated?' is the wordplay.
'post office' becomes 'po' (abbreviation).
'in' means one lot of letters goes inside another.
'translated?' indicates anagramming the letters (I've seen 'translate' mean this).
'russian'+'too'+'why'='russiantoowhy'
'russiantoowhy' anagrammed gives 'whatsyourison'.
'po' put inside 'whatsyourison' is 'WHATS YOUR POISON'.
(Other definitions for whats your poison that I've seen before include "Local offer" , "A question that may be asked at the bar" .)