What beats transport system old men reconstructed (9)

I believe the answer is:

metronome

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'what beats transport' is the definition.
I can't tell whether this defines the answer.

'system old men reconstructed' is the wordplay.
'system' becomes 'metro' (I have seen 'Underground system ' mean 'metro' so perhaps 'system' could also mean 'metro').
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'reconstructed' indicates an anagram.
'o'+'men'='omen'
'omen' with letters rearranged gives 'nome'.
'metro'+'nome'='METRONOME'

Can you help me to learn more?

(Other definitions for metronome that I've seen before include "Device to help regulate tempo" , "Ticker setting tempo of music" , "Musical timekeeper" , "Musician's timekeeper" , "Device for keeping time" .)

I've seen this clue in The Times.

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