Sitting on the fence -- Tyne ritual when drunk (10)
I believe the answer is:
neutrality
'sitting on the fence' is the definition.
(sitting on the fence means being neutral)
'tyne ritual when drunk' is the wordplay.
'when drunk' is an anagram indicator (a drunken or disorderly form of the letters).
'tyne'+'ritual'='tyneritual'
'tyneritual' is an anagram of 'NEUTRALITY'.
(Other definitions for neutrality that I've seen before include "Detachment" , "Impartial policy" , "Non-aligned state" .)