I'm a long time providing pictures (6)
I believe the answer is:
images
'pictures' is the definition.
('image' can be a synonym of 'picture')
'i'm a long time' is the wordplay.
'a long time' becomes 'ages' (ages can mean a very long time).
'im'+'ages'='IMAGES'
'providing' acts as a link.
(Other definitions for images that I've seen before include "Reflections in mirrors" , "Pictures, representations" , "visions" , "ideas" , "works by Debussy" .)