Preoccupy (6)

I think it could be either:

obsess

fixate

'preoccupy' is the definition.
(obsessing is a kind of preoccupying)

This is all the clue.

(Other definitions for obsess that I've seen before include "Plague" , "Prey on" , "Persistently preoccupy" , "Preoccupy continually" , "Constantly worry (about something)" .)

I've seen this clue in the Penny Press, The Guardian, the Sydney Morning Herald, The Independent, The Sunday Times, the Newsday, The Telegraph, The Sun and The Times.

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