Confer knighthood? Indubitably! (3)
I believe the answer is:
dub
'confer knighthood?' is the definition.
(I've seen this before)
'indubitably' is the wordplay.
'DUB' is hidden within the letters.
But, I am uncertain how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for dub that I've seen before include "Reggae" , "Knight (someone) with a sword" , "Add soundtrack to film in another language" , "Copy to tape or disc" , "Give nickname, knighthood, to" .)