Dip huge — right to replace knight (7)

I believe the answer is:

immerse

'dip' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for immerse that I've seen before include "Baptise" , "Dip totally into liquid" , "Plunge deep into liquid" , "Dip under the surface of a liquid completely" , "Absorb" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app