Fashionable, initially expensive, brace for worker (7)
I believe the answer is:
elegant
'fashionable' is the definition.
(thesaurus)
'initially expensive brace for worker' is the wordplay.
'initially' indicates taking the first letters.
'brace for' becomes 'leg' (I can't justify this - if you can you should give a lot more credence to this answer).
'worker' becomes 'ant' (worker is a type of ant).
The first letter of 'expensive' is 'e'.
'e'+'leg'+'ant'='ELEGANT'
Can you help me to learn more?
(Other definitions for elegant that I've seen before include "Debonair, stylishly dressed" , "Neat leg? (anag)" , "Attractive and graceful or stylish" , "A gentle sort of stylish appearance" , "Dignified and graceful" .)