Took to be absent-minded (10)
I believe the answer is:
abstracted
I believe this clue is a double definition.
'took to be' is the first definition.
(abstracting is a kind of taking to be)
'absent-minded' is the second definition.
(thesaurus)
(Other definitions for abstracted that I've seen before include "Taken out" , "inattentive" , "not paying attention" , "Removed - preoccupied - absent-minded" , "without concentrating" .)