Old patriot remains in faction, not turning (10)
I believe the answer is:
washington
'old patriot' is the definition.
(US president George Washington)
'remains in faction not turning' is the wordplay.
'remains' becomes 'ash' (remains of a fire).
'in' means one lot of letters goes inside another.
'faction' becomes 'wing' (a group within an organisation).
'turning' says the letters should be written in reverse.
'not' in reverse letter order is 'ton'.
'ash' going into 'wing' is 'washing'.
'washing'+'ton'='WASHINGTON'
(Other definitions for washington that I've seen before include "American general and president" , "See 3" , "Old president" , "Seattle's state" , "US capital" .)