Free trade restrained by low speed (8)

I believe the answer is:

moderato

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'speed' is the definition.
The answer and definition are not the same part of speech.

'free trade restrained by low' is the wordplay.
'free' is an anagram indicator.
'restrained by' is an insertion indicator.
'low' becomes 'moo' (both can mean to make a cow noise).
'trade' anagrammed gives 'derat'.
'derat' put into 'moo' is 'MODERATO'.

Can you help me to learn more?

(Other definitions for moderato that I've seen before include "with mean speed!" , "At average speed (music)" , "Musically fairly slow" , "with steady movement" , "At an average pace (music)" .)

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

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