Turnip chopped with one’s stuffing: what could be fresher? (5)

'what could be fresher?' is the definition.
(term for something or someone new)

'turnip chopped with one's stuffing' is the wordplay.
'turnip' becomes 'neep' (Scottish term for a turnip).
'chopped' means to remove the last letter.
'with' becomes 'w' (abbreviation**).
'one' becomes 'i' (Roman numeral).
'stuffing' indicates putting letters inside.
'neep' with its final letter taken away is 'nee'.
'w'+'i'='wi'
'nee' enclosing 'wi' is 'NEWIE'.