Early hunters who lived hollow lives? (7)

I believe the answer is:

cavemen

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

'early hunters who lived' is the definition.
I can't judge whether this definition defines the answer.

'hollow lives?' is the wordplay.
'hollow' becomes 'cave' (caving is a kind of hollowing).
'lives?' becomes 'men' (I can't explain this - if you can you should give a lot more credence to this answer).
'cave'+'men'='CAVEMEN'

Can you help me to learn more?

(Another definition for cavemen that I've seen is " Ancient males who lived in holes in hills".)

I've seen this clue in The Globe and Mail.

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