Forgetful, pre-occupied (6-6)

I believe the answer is:

absent-minded

(Other definitions for absent-minded that I've seen before include "Given to woolgathering" , "Forgetful, inattentive" , "Vague and forgetful" , "Wandering" , "Preoccupied U forgetful" .)

I've seen this clue in The Guardian.

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