I seems to me that, albeit with an uncommon first name at 14ac, all other entries in the grid are real words or abbreviations, or have I made a mistake??
31 D. Wacko's spread dole out along the way (4) Oleo - spread/margarine in the US, Wacko really being Waco, removing the K).
37 A. Rolling meadow in New England? It's no longer used to make vetch (5) Neele, It's Lee, meadow, and NE, New England,, Neele is in Chambers, an obsolete form of 'needle' (which fits the 'etch', not Vetch, in the clue).
bobbycollins, because the wordplay in 35d comprises an anagram of meat + e (energy) then the extra A required to complete WONKA could in theory have been supplied by either device. However the surface reading would not really make sense if it read 'Old side of met prepared ...'