Shares drink with son after no one turned up (8)
I believe the answer is:
portions
'shares' is the definition.
('portion' can be a synonym of 'share')
'drink with son after no one turned up' is the wordplay.
I cannot really see how this works, but
'drink' could be 'port' (port is a kind of drink) and 'port' is found within the answer.
an anagram of 'son' is 'ons' which is within the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for portions that I've seen before include "Helpings (of food)" , "Pieces" , "Parts of a whole" , "Shares, servings" .)