Recititive musical quality in a Spanish river like that? (6)

I believe the answer is:

arioso

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'recititive musical quality' is the definition.
I can't judge whether this definition defines the answer.

'a spanish river like that?' is the wordplay.
'spanish river' becomes 'rio' (I've seen this in another clue).
'like that?' becomes 'so' (as in 'like so').
'a'+'rio'+'so'='ARIOSO'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for arioso that I've seen before include "Song-like (Italian)" , "piece of music is discovered" , "Lyrical piece" .)

I've seen this clue in the Sydney Morning Herald.

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