Brass instrument, large and cylindrical (5)

I believe the answer is:

tubal

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'cylindrical' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?

'brass instrument large' is the wordplay.
'brass instrument' becomes 'tuba' (I've seen this in another clue).
'large' becomes 'L' (eg in clothes sizes).
'tuba'+'l'='TUBAL'

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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