The sound of tongues wagging: Orestes losing last couple of offies (6,6)
I believe the answer is:
liquor stores
'offies' is the definition.
(off-licence shops)
'the sound of tongues wagging orestes losing last' is the wordplay.
'the sound of tongues' becomes 'liquor' (I am not sure about this - if you are sure you should believe this answer much more).
'wagging' indicates anagramming the letters (I've seen this in other clues).
'losing' indicates named letters should be taken away.
'last' becomes 'e' (I've seen this in other clues).
'orestes' with 'e' taken away is 'orstes'.
'orstes' is an anagram of 'stores'.
'liquor'+'stores'='LIQUOR STORES'
'couple of' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.