Crossword Genius

Hear uncle out - it's rather strong (9)

Ross

I believe the answer is:

herculean

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'rather strong' is the definition.
I can't judge whether this definition defines the answer.

'hear uncle out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'hear'+'uncle'='hearuncle'
'hearuncle' with letters rearranged gives 'HERCULEAN'.

'it's' acts as a link.

Can you help me to learn more?

(Other definitions for herculean that I've seen before include "Monumental (task)" , "Requiring very great effort" , "Enormously demanding (task)" , "Showing great strength" , "Powerful" .)

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