Exclamation of annoyance about two different names given to a swordsman (9)
I believe the answer is:
dartagnan
'exclamation of annoyance' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'about two different names given to a swordsman' is the wordplay.
I cannot quite see how this works, but
'about' could be 'dart' (I've seen this before) and 'dart' is found in the answer.
'a' could be 'an' and 'an' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for dartagnan that I've seen before include "romanticised by Dumas" , "Hero of Les Trois Mousquetaires (Dumas)" , "French hero ..." , "Front of advancing army" , "Hero of The Three Musketeers" .)