Crossword Genius

All backed leaders of General Assembly in The House pictures (6)

Ross

I believe the answer is:

images

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'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" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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