Crossword Genius

Extra tie David knotted (8)

Ross

I believe the answer is:

additive

'extra' is the definition.

'tie david knotted' is the wordplay.
'knotted' indicates an anagram.
'tie'+'david'='tiedavid'
'tiedavid' is an anagram of 'ADDITIVE'.

(Other definitions for additive that I've seen before include "Substance stirred in to colour or flavour food" , "flavouring perhaps" , "Something put into food" , "Substance put into food" , "Eg, a colorant or preservative in foods" .)

I've seen this clue in The Guardian.
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