Couple eating a dry Scots vegetable (6)

I believe the answer is:

tattie

'scots vegetable' is the definition.
(Scottish term for potato)

'couple eating a dry' is the wordplay.
'couple' becomes 'tie' (I've seen this in other clues).
'eating' indicates putting letters inside.
'dry' becomes 'tt' (abbreviation for teetotal).
'a'+'tt'='att'
'tie' going around 'att' is 'TATTIE'.

(Another definition for tattie that I've seen is " Murphy".)

I've seen this clue in The Independent.

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