Write in hope, naturally (3)
I believe the answer is:
pen
'write' is the definition.
(synonyms)
'in hope naturally' is the wordplay.
'in' says the answer is hidden in the clue.
'PEN' is hidden in the letters of 'hope naturally'.
(Other definitions for pen that I've seen before include "record" , "Writing tool" , "Coop" , "Animal enclosure" , "'The ... is mightier than the sword'" .)