Audacious saints invading vicar's Thames-side location (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
brassy
(Other definitions for brassy that I've seen before include "club" , "Metallic; tastelessly loud" , "Audacious" , "Showy - harsh" , "Sounding like cornet maybe" .)