Threads in edge of antifascist flag (6)
I believe the answer is:
attire
'threads' is the definition.
(I've seen this in another clue)
'edge of antifascist flag' is the wordplay.
'edge of' suggests removing the centre (I've seen 'edges of' mean this).
'flag' becomes 'tire' (both can mean to become weary).
'antifascist' with its middle taken out is 'at'.
'at'+'tire'='ATTIRE'
'in' is the link.
(Other definitions for attire that I've seen before include "Formal clothing" , "12" , "I treat badly the dress." , "Formal dress or costume" , "Formal clothes" .)