Feature of tremendous way to improve text (5)
I believe the answer is:
emend
'improve text' is the definition.
(I've seen this in another clue)
'feature of tremendous way' is the wordplay.
'feature of' says the answer is hidden in the clue.
'EMEND' can be found hidden inside 'tremendous way'.
'to' is the link.
(Other definitions for emend that I've seen before include "Correct, revise (text)" , "Alter something written to correct errors" , "change" , "Make changes to (a text)" , "Alter to improve (text)" .)