Low frame in front of a fireplace (6)
I believe the answer is:
fender
(Other definitions for fender that I've seen before include "Protection round fireplace; electric guitar brand" , "Ship's protection against impact" , "Feature of vehicle from 24 [US SAY]" , "It's a car bumper in America, a fire surround here" , "Hearth guard also protects the ship's side" .)