Extended desire (4)
I believe the answer is:
long
I believe this clue is a double definition.
'extended' is the first definition.
(similar in meaning)
'desire' is the second definition.
(I know that long is a more specific form of the action desire)
(Other definitions for long that I've seen before include "Thus having been treated by stretcher, perhaps" , "to be tall" , "Protracted" , "Extensive - pine" , "Pant" .)