In charge in Asian country, set up informal gathering (6)
I believe the answer is:
social
'informal gathering' is the definition.
(I've seen this before)
'in charge in asian country set up' is the wordplay.
'in charge' becomes 'ic'.
'in' is an insertion indicator.
'asian country' becomes 'laos' (Laos is an example).
'set up' is a reversal indicator.
'ic' put within 'laos' is 'laicos'.
'laicos' in reverse letter order is 'SOCIAL'.
(Other definitions for social that I've seen before include "Official helping families with problems" , "Needing companionship" , "Seeking companionship" , "Public servant caring for the underprivileged" , "Of society or its organisation" .)