Swagger, endlessly undaunted by fuss (7)
I believe the answer is:
bravado
'swagger' is the definition.
(I've seen this before)
'endlessly undaunted by fuss' is the wordplay.
'endlessly' means to remove the last letter.
'undaunted' becomes 'brave' (similar in meaning).
'by fuss' becomes 'ado' (synonyms. I am not sure about the 'by' bit.).
'brave' with its final letter taken off is 'brav'.
'brav'+'ado'='BRAVADO'
Can you help me to learn more?
(Other definitions for bravado that I've seen before include "Boastful swagger" , "Unjustified assertion of confidence" , "Swaggering show of false courage" , "Swaggering show of boldness" , "Boastful courage" .)