All backed leaders of General Assembly in The House pictures (6)
I believe the answer is:
images
'pictures' is the definition.
('image' can be a synonym of 'picture')
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for images that I've seen before include "works by Debussy" , "Ageism (anag)" , "Pictures or photos" , "These doubles could be spitting" , "Pictures; metaphors" .)