Channel in Hebrew essentially making a comeback (5)
I believe the answer is:
sewer
'channel' is the definition.
(sewer is a kind of channel)
'in hebrew essentially making a comeback' is the wordplay.
'in' indicates the answer is hidden within the clue.
'making a comeback' says the letters should be written in reverse.
'rewes' can be found hidden inside 'hebrew essentially'.
'rewes' written backwards gives 'SEWER'.
(Other definitions for sewer that I've seen before include "One working with material?" , "Drainage pipe" , "Embroiderer; soil pipe" , "Waste-pipe" , "Channel to carry away waste water and matter" .)