Slowly moving along with advance payment (7)

I believe the answer is:

andante

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'slowly' is the definition.
(musical term)

'with advance payment' is the wordplay.
'with' becomes 'and'.
'advance payment' becomes 'ante' (I've seen this in another clue).
'and'+'ante'='ANDANTE'

'moving along' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for andante that I've seen before include "progressing slowly" , "(Musically) at a moderate pace" , "Musically, in moderately slow time" , "Moderately slow (mus.)" , "Moving fairly slowly" .)

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

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