Crossword Genius

I annoy constantly with bit of obscene sauce (5)

Ross

I believe the answer is:

pesto

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'sauce' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for pesto that I've seen before include "sauce involving Basil" , "Pasta sauce mainly of basil and cheese" , "Sauce of basil, pine nuts, etc" , "Pasta sauce based on basil" , "Basic sauce" .)

I've seen this clue in The Independent.
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