Fly perhaps from trendy religious faction (6)
I believe the answer is:
insect
'fly perhaps' is the definition.
(I know that fly is a type of dipteran)
'trendy religious faction' is the wordplay.
'trendy' becomes 'in' ('in' can mean fashionable).
'religious faction' becomes 'sect' (I've seen this before).
'in'+'sect'='INSECT'
'from' is the link.
(Other definitions for insect that I've seen before include "Creepy-crawly" , "may be attracted to a website?" , "Member of the largest class of creatures" , "Cricket perhaps" , "A fly, for instance" .)