Supposes to have dropped in the pictures (6)
I believe the answer is:
images
'pictures' is the definition.
('image' can be a synonym of 'picture')
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for images that I've seen before include "Representations or reflections" , "Reflections in a mirror" , "Likenesses or effigies" , "Semblances" , "visions" .)