Thin out entire workers' rising (3-4)

I believe the answer is:

ant-hill

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

'workers' rising' is the definition.
The definition suggests a singular noun which matches the answer.

'thin out entire' is the wordplay.
I cannot quite see how this works, but
an anagram of 'thin' is 'nthi' which is within the answer.
'entire' could be 'all' (I've seen this in another clue) and 'all' is found within the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

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

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