Crossword Genius

Legal tender? (10,5)

Ross

I think it could be either:

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5

10,5

registered nurse

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'legal tender?' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'tender?' is the wordplay.
I cannot really see how this works, but
'tender?' could be 'nurse' (someone who tends to patients) and 'nurse' is found within the answer.
The remaining letters 'registered' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the New York Times, The Telegraph, The Times and The Sunday Times.
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