A bishop ecstatic, distracted (6)
I believe the answer is:
absent
'distracted' is the definition.
(absent-minded)
'a bishop ecstatic' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'ecstatic' becomes 'sent' (I've seen this in other clues).
'a'+'b'+'sent'='ABSENT'
(Other definitions for absent that I've seen before include "Not attending" , "Not where one should be" , "Inattentive" , "lack of attention" , "Not at a specified place" .)