Composition mariachi penned (4)

I believe the answer is:

aria

I'm a little stuck... Click here to teach me more about this clue!

'composition' is the definition.
(aria is a kind of musical composition)

'mariachi penned' is the wordplay.
'ARIA' is hidden within the letters.
However, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for aria that I've seen before include "Summertime perhaps" , "Song from an opera (4)" , "part of opera, maybe" , "Operatic solo performance" , "Operatic tune" .)

I've seen this clue in The Times and The Sunday Times.

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