Embrace superior manner that’s upset French protestant (8)
I believe the answer is:
huguenot
'french protestant' is the definition.
(I've seen this before)
'embrace superior manner that's upset' is the wordplay.
'embrace' becomes 'hug' (synonyms).
'superior' becomes 'u' (I've seen this in other clues).
'manner' becomes 'tone'.
'that's upset' says the letters should be written in reverse.
'tone' in reverse letter order is 'enot'.
'hug'+'u'+'enot'='HUGUENOT'
(Other definitions for huguenot that I've seen before include "French Protestant who may have emigrated to Ireland in 17th century" , "Persecuted French protestant" , "C16-17 French Protestant" , "This French protester" , "Historically, a French protestant" .)