Group of coots in Asia flying (11)
I believe the answer is:
association
'group' is the definition.
(association is a kind of group)
'coots in asia flying' is the wordplay.
'flying' is an anagram indicator.
'coots'+'in'+'asia'='cootsinasia'
'cootsinasia' with letters rearranged gives 'ASSOCIATION'.
'of' acts as a link.
(Other definitions for association that I've seen before include "Company" , "Bond" , "Alliance; connection" , "Conceptual connection" , "Corporation" .)