Big brass twice contracted Yank HQ (5)
I believe the answer is:
tubas
'big brass' is the definition.
(I've seen this in another clue)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for tubas that I've seen before include "What some musicians" , "Large brass instruments" .)
I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution?
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