Posed with bird embracing large trollop (8)
I believe the answer is:
slattern
'trollop' is the definition.
(slattern is a kind of trollop)
'posed with bird' is the wordplay.
'posed with' becomes 'slat' (I can't justify this - if you can you should believe this answer much more).
'bird' becomes 'tern' (tern is a kind of bird).
'slat'+'tern'='SLATTERN'
'embracing large' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for slattern that I've seen before include "Rent last (anag) - slut" , "not a smart girl" , "Cow" , "Sloven" , "Drab" .)