Ancient wood and a little metal in old instrument (5)

I believe the answer is:

shawm

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'old instrument' is the definition.
(historical type of wind instrument)

'ancient wood and a little metal' is the wordplay.
'ancient wood' becomes 'shaw' (I've seen this before. I am not sure about the 'ancient' bit.).
'and' says to put letters next to each other.
'a little' suggests taking the first letters.
The initial letter of 'metal' is 'm'.
'shaw'+'m'='SHAWM'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for shawm that I've seen before include "Medieval and Renaissance wind instrument" , "Old wind instrument" , "old music-maker" .)

I've seen this clue in The Guardian.

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