One small drink during meeting? 500 get wasted (10)
I believe the answer is:
dissipated
'wasted' is the definition.
(dissipating is a kind of wasting)
'one small drink during meeting? 500' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
'small' could be 's' (abbreviation - e.g. clothes size) and 's' is located in the answer.
'drink' could be 'sip' (I've seen this before) and 'sip' is located in the answer.
'meeting?' could be 'date' (date is a kind of meeting) and 'date' is present in the leftover letters.
'500' could be 'd' ('d' can be a synonym of '500') and 'd' is found in the answer.
No letters remain.
This explanation may well be incorrect...
'get' acts as a link.
(Other definitions for dissipated that I've seen before include "wasted?" , "Degenerate" , "Dissolute" , "Squandered - debauched" , "Overindulgent" .)