Extended dream (4)
I believe the answer is:
long
I believe this is a double definition.
'extended' is the first definition.
(similar in meaning)
'dream' is the second definition.
(I've seen this before)
(Other definitions for long that I've seen before include "Pant" , "Protracted" , "die" , "Thus having been treated by stretcher, perhaps" , "Yearn (for)" .)