Sit awkwardly during social function's interval (8)
I believe the answer is:
distance
'interval' is the definition.
(I've seen this before)
'sit awkwardly during social function's' is the wordplay.
'awkwardly' indicates anagramming the letters.
'during' indicates putting letters inside.
'social function' becomes 'dance' (I've seen this before).
'sit' with letters rearranged gives 'ist'.
'ist' inserted inside 'dance' is 'DISTANCE'.
(Other definitions for distance that I've seen before include "standoffishness" , "Length of space between one place and another" , "Length between two points" , "Full extent of fighting" , "The gap between two places" .)