Slowly advanced, reaching roundabout? (5)

I believe the answer is:

lento

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'slowly' is the definition.
('lento' can be a synonym of 'slowly')

'advanced reaching roundabout?' is the wordplay.
'advanced' becomes 'lent' (money).
'reaching roundabout?' becomes 'o' (I can't justify this - if you can you should give a lot more credence to this answer).
'lent'+'o'='LENTO'

Can you help me to learn more?

(Other definitions for lento that I've seen before include "Slow passage" , "Old sayings" , "Scored slowly" , "Slow (mus.)" , "Slow musically" .)

I've seen this clue in The Independent.

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