Man of tomorrow (3)

I believe the answer is:

tom

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This might be a double definition.

'man' is the first definition.

'tomorrow?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for tom that I've seen before include "- Lehrer, US humorist" , "Queen's mate" , "Bell" , "Pig-stealing piper's son" , "famous schoolboy" .)

I've seen this clue in the Evening Standard.

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