Crossword Genius

In London, a nurse's station? (5)

Ross

I believe the answer is:

angel

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'in london' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'a nurse's station?' is the wordplay.
'a' becomes 'an'.
'nurse's station?' becomes 'gel' (I can't explain this - if you can you should believe this answer much more).
'an'+'gel'='ANGEL'

Can you help me to learn more?

(Other definitions for angel that I've seen before include "Divine messenger" , "Person of beauty, purity or kindness?" , "Glean (anag.)" , "Cloud resident?" , "Messenger < is a nurse" .)

I've seen this clue in the Evening Standard.
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