Crossword Genius

Compelled former pupil to glide off (7)

Ross

I believe the answer is:

obliged

'compelled' is the definition.
('oblige' can be a synonym of 'compel')

'former pupil to glide off' is the wordplay.
'former pupil' becomes 'OB' (abbreviation for 'Old Boy').
'off' indicates an anagram.
'glide' is an anagram of 'liged'.
'ob'+'liged'='OBLIGED'

(Other definitions for obliged that I've seen before include "Constrained" , "Did favour to, or coerced" , "Made bound (to do something)" , "Bound by a favour rendered" , "Grateful - compelled" .)

I've seen this clue in The Daily Express.
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