Cryptic

[professorplum13]

District's backed endless veg imports in business (5) ?ONAL
..must be ZONAL but how does it parse please?

[scorpiojo]

Are you sure of the letters?

[Oldred]

????:vegetable

[Oldred]

please ignore - thinking aloud!

[professorplum13]

pretty sure of them - the crossers come from clues where extra letters were generated and they all "fit" the theme.

[Davemano]

Are you sure of the N because I think it might be a C

[professorplum13]

The A came from the first letter of this down clue:
Scrap yearbook containing only one article , principally which I thought was annual without it's 2nd A making annul ??

[Davemano]

professor - thanks, that seems right. I was thinking the answer could be LOCAL Endless veg a ShALLot with CO a business, turned into an anagram.

[Kobnut]

Veg is Short for vegetate hence LAZE , and in business is ON.

[Davemano]

Kobnut - excellent