Crossword Genius

All-consuming idea (9)

Ross

I believe the answer is:

obsession

'all-consuming idea' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for obsession that I've seen before include "Fixed idea" , "Phobia" , "Compulsion, fixation" , "Extreme interest" , "Continual preoccupation" .)

I've seen this clue in The Sun and The Times.
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