Crossword Genius

Elbow the anatomist is lacking? So true! (4,2,4)

Ross

I believe the answer is:

amen to that

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

'true' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'elbow the anatomist is lacking?' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'lacking?' could be 'no' (eg lacking money means with no money) and 'no' is found within the leftover letters.
This explanation may well be incorrect...

'so' acts as a link.

Can you help me to learn more?

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