Son's changed despite chasing skirt (8)
I believe the answer is:
sidestep
'skirt' is the definition.
('sidestep' can be a synonym of 'skirt')
'son's changed despite chasing' is the wordplay.
'changed' is an anagram indicator.
'chasing' is a charade indicator (letters next to each other).
'despite' with letters rearranged gives 'idestep'.
's'+'idestep'='SIDESTEP'
(Other definitions for sidestep that I've seen before include "To avoid" , "Shift to right or left" , "Dodge (an issue?)" , "Find a way round" , "Dodge - circumvent" .)