Bugs former pupil attending meetings (10)

I believe the answer is:

obsessions

'bugs' is the definition.
(bug can mean an obsessive interest in something)

'former pupil attending meetings' is the wordplay.
'former pupil' becomes 'OB' (abbreviation for 'Old Boy').
'attending' says to put letters next to each other.
'meetings' becomes 'sessions' (session is a kind of meeting).
'ob'+'sessions'='OBSESSIONS'

(Another definition for obsessions that I've seen is " Things".)

I've seen this clue in The Guardian.

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