Labour in 2024? A lot are switching (3,4)

I believe the answer is:

man year

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'labour in 2024?' is the definition.
I can't tell whether this definition defines the answer.

'a lot are switching' is the wordplay.
'a lot' becomes 'many' (many means a lot).
'switching' indicates anagramming the letters (letters switch places).
'are' with letters rearranged gives 'ear'.
'many'+'ear'='MAN-YEAR'

Can you help me to learn more?

(Other definitions for man year that I've seen before include "Work unit" , "Amount of work" , "Worker's effort" , "measure of effort" .)

I've seen this clue in The Independent.

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