Father always creates a disturbance (4)
I believe the answer is:
fray
'a disturbance' is the definition.
(I know that disturbance can be written as fray)
'father always' is the wordplay.
'father' becomes 'fr' (abbreviation as in a priest's title).
'always' becomes 'ay' (archaic term for 'always').
'fr'+'ay'='FRAY'
'creates' acts as a link.
(Other definitions for fray that I've seen before include "Become irritated" , "Wear away from rubbing" , "Ravel" , "Become worn at the edges" , "Become threadbare - fight" .)