Sauce collected by vassal, address in Greenwich (5,8)

I believe the answer is:

salad dressing

'sauce' is the definition.
(salad dressing is a kind of sauce)

'collected by vassal address in greenwich' is the wordplay.
'collected by' says the answer is hidden in the clue.
'SALAD-DRESSING' is hidden within 'vassal address in greenwich'.

(Other definitions for salad dressing that I've seen before include "Mayonnaise, e.g." , "sauce" , "what goes on rocket?" , "Eg, Thousand Island or French" , "saucy thing!" .)

I've seen this clue in The Telegraph.

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