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 Sunday Times, The Times, The Independent, The Sun, the Sydney Morning Herald, The Telegraph and The Guardian.

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