She lets bra loose getting excited (10)
I believe the answer is:
breathless
'excited' is the definition.
(thesaurus)
'she lets bra loose' is the wordplay.
'loose' is an anagram indicator (letters are loosened from their original positions).
'she'+'lets'+'bra'='sheletsbra'
'sheletsbra' is an anagram of 'BREATHLESS'.
'getting' is the link.
(Other definitions for breathless that I've seen before include "Still" , "Gasping for air" , "panting?" , "Spent" , "Short-winded" .)