Create one new hole (6)
I believe the answer is:
invent
'create' is the definition.
(thesaurus)
'one new hole' is the wordplay.
'one new' becomes 'in' (I've seen this in other clues).
'hole' becomes 'vent' (vent is a kind of hole).
'in'+'vent'='INVENT'
(Other definitions for invent that I've seen before include "Come up with" , "Design - discover" , "Make or design something original" , "Devise (something new)" , "Design something new, create by thought" .)