Fast old music speed (5)

I believe the answer is:

lento

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

'fast old music speed' is the definition.
Both the definition and answer are adverbs. Maybe there's an association between them I don't understand?

'fast old' is the wordplay.
'fast' becomes 'lent' (Lent is a period of fasting in Christianity).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'lent'+'o'='LENTO'

Can you help me to learn more?

(Other definitions for lento that I've seen before include "Old sayings" , "Slow musically" , "Scored slowly" , "Musically low speed" , "How one scores slowly" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.

Connecting...