Crossword Genius

Wig returned to university teacher (4)

Ross

I believe the answer is:

guru

'teacher' is the definition.
(teacher or guide)

'wig returned to university' is the wordplay.
'wig' becomes 'rug' (rug is a slang term for a wig).
'returned' says the letters should be written in reverse.
'to university' becomes 'U' (abbreviation as in UMass).
'rug' reversed gives 'gur'.
'gur'+'u'='GURU'

(Other definitions for guru that I've seen before include "Religious leader and spiritual teacher" , "Revered mentor" , "Hindu or Buddhist spiritual teacher" , "Master, mentor" , "Spiritual guide" .)

I've seen this clue in The Sun.
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