Crossword Genius

Left without 100 goods' slow movement (5)

Ross

I believe the answer is:

largo

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

'slow movement' is the definition.
(I've seen this before)

'left without 100 goods'' is the wordplay.
I cannot quite understand how this works, but
'left' could be 'l' (common abbreviation) and 'l' is present in the answer.
The remaining letters 'argo' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for largo that I've seen before include "(Musically) slow in tempo and broad in manner" , "Musical piece" , "moving slowly" , "To be played slowly and broadly" , "at stately speed" .)

I've seen this clue in The Everyman puzzle in The Observer.
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