Turn carpet over for spiritual teacher (4)
I believe the answer is:
guru
'for spiritual teacher' is the definition.
(I've seen this in another clue)
'turn carpet over' is the wordplay.
'turn' becomes 'u' (a 'U-turn' is a kind of turn).
'carpet' becomes 'rug' (synonyms).
'over' shows that the letters should be reversed in order.
'u'+'rug'='urug'
'urug' back-to-front is 'GURU'.
(Other definitions for guru that I've seen before include "Master, mentor" , "Recognised expert in some field" , "Wise leader" , "Hindu or Buddhist spiritual teacher" , "Swami" .)