Catch ruffian grabbing muzzle of revolver: it's placed nearby to fire (6,3)
I believe the answer is:
hearth rug
'it's placed nearby to fire' is the definition.
(a hearth rug goes by a fireplace)
'catch ruffian grabbing muzzle of revolver' is the wordplay.
'catch' becomes 'hear' (to catch something is to hear it being spoken).
'ruffian' becomes 'thug' (both can mean a violent person).
'grabbing' means one lot of letters goes inside another.
'muzzle of' suggests the final letters (muzzle can mean the end of something).
The final letter of 'revolver' is 'r'.
'thug' placed around 'r' is 'thrug'.
'hear'+'thrug'='HEARTH-RUG'
(Other definitions for hearth rug that I've seen before include "Warm floor covering" , "one's laid out in front of fire" .)