Crossword Genius

Container for all that old brass (7)

Ross

I believe the answer is:

sackbut

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'old brass' is the definition.
'sackbut' can be an answer for 'brass' (sackbut is a kind of brass). I am unsure of the 'old' bit.

'container for all' is the wordplay.
'container' becomes 'sack' (sack is a kind of container).
'for all' becomes 'but' (I can't justify this - if you can you should believe this answer much more).
'sack'+'but'='SACKBUT'

'that' is the link.

Can you help me to learn more?

(Other definitions for sackbut that I've seen before include "one on the slide" , "music maker" , "Medieval form of trombone" , "Old instrument" , "Musical instrument of the Renaissance" .)

I've seen this clue in The Times.
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