Brass instruments (5)
There are a few possibilities for this:
trombones
'brass instruments' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tubas that I've seen before include "What some musicians" , "Large brass instruments" .)
'brass instruments' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for horns that I've seen before include "Klaxons" , "Noisemakers on the road" , "Bony outgrowths on the heads of some animals" .)
'brass instruments' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for trombones that I've seen before include "Seventy six were noted!" , "Their slides have seven positions" , "Brass instruments" .)