Artwork featuring headless parrot inside wire bars (7)
I believe the answer is:
collage
'artwork' is the definition.
(I've seen this before)
'headless parrot inside wire bars' is the wordplay.
'headless' means to remove the first letter.
'parrot' becomes 'poll' (poll is a kind of parrot).
'inside' indicates putting letters inside.
'wire bars' becomes 'cage' (I am not sure about this - if you are sure you should believe this answer much more).
'poll' with its first letter taken off is 'oll'.
'oll' placed inside 'cage' is 'COLLAGE'.
'featuring' acts as a link.
Can you help me to learn more?
(Other definitions for collage that I've seen before include "Artwork from sundry stuck-on items" , "Art form using pieces stuck on" , "Composition made by fixing pieces to a surface" , "work of art" , "Style of artwork" .)