Crossword Genius

Extremely sweet, old, grey and boring (6)

Ross

I believe the answer is:

stodgy

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

I don't understand how the rest of the clue works.

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(Other definitions for stodgy that I've seen before include "not easily assimilated" , "(Of food) solid and heavy" , "Heavy to eat" , "(Of food) heavy, rich" , "Heavy, starchy and hard to digest" .)

I've seen this clue in The Telegraph.
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