Crossword Genius

Hospital numbers (13)

Ross

I believe the answer is:

anaesthetists

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

'hospital numbers' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.

'hospital numbers' is the wordplay.
I cannot quite see how this works, but
'hospital' could be 'h' (abbreviation for hospital on maps) and 'h' is found in the answer.
'numbers' could be 'is' (I is an example) and 'is' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Irish Independent.
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