Gorge in do to welcome in a New Year (6)
I believe the answer is:
canyon
'gorge' is the definition.
(I've seen this before)
'do to welcome in a new year' is the wordplay.
'do' becomes 'con' (both can mean to defraud).
'to welcome in' indicates putting letters inside.
'new year' becomes 'ny' (abbreviation).
'a'+'ny'='any'
'con' enclosing 'any' is 'CANYON'.
'in' is the link.
(Other definitions for canyon that I've seen before include "(N. Am.) ravine" , "The Grand . . . . . . of Colorado is a natural phenomenon in USA" , "Ravine formed by a river" , "Narrow steep-sided valley" , "Deep fissure" .)