Stylish but frustrating? (7)
I believe the answer is:
dashing
I believe this clue is a double definition.
'stylish' is the first definition.
(thesaurus)
'frustrating?' is the second definition.
(I've seen this before)
'but' acts as a link.
(Other definitions for dashing that I've seen before include "Swashbuckling" , "Stylish, adventurous" , "Striking" , "Adventurous, confident" , "Making haste" .)