Deny King Edward, for example, has returned (5)
I believe the answer is:
rebut
'deny' is the definition.
(I've seen this before)
'king edward for example has returned' is the wordplay.
'king edward for example' becomes 'tuber' (King Edward potato is a type of tuber).
'has returned' says the letters should be written backwards.
'tuber' written backwards gives 'REBUT'.
(Other definitions for rebut that I've seen before include "Prove (something) to be false" , "Rebuff; deny" , "Tuber (anag.)" , "Refute - disprove" , "Contradict or disprove" .)