Opening in yoga, teaching (4)
I believe the answer is:
gate
'opening' is the definition.
(I have seen 'Movable opening ' mean 'gate' so perhaps 'opening' could also mean 'gate')
'in yoga teaching' is the wordplay.
'in' indicates a hidden word.
'GATE' can be found hidden inside 'yoga teaching'.
(Other definitions for gate that I've seen before include "Movable opening" , "Entry barrier as to field" , "Box office take" , "Spectators - entrance" , "Field entrance" .)