Made bigger (8)
(Other definitions for extended that I've seen before include "get out" , "Made longer" , "Stretched out over time or space" , "Reached out for next deed" , "Lengthy" .)
'made bigger' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for enlarged that I've seen before include "Made bigger like photo" , "Made greater" , "Made bigger, say photo" , "Elaborated or made bigger" , "Expanded, amplified" .)