Crossword Genius

Relation of a city to its auditors (5)

Ross

I believe the answer is:

niece

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

'relation' is the definition.
(niece is a kind of relation)

'city to its auditors' is the wordplay.
I cannot quite see how this works, but
'city' could be 'ec' (the City of London postcode) and 'ec' is found in the answer.
The remaining letters 'nie' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'of a' is the link.

Can you help me to learn more?

(Other definitions for niece that I've seen before include "A sibling's child" , "A sibling's daughter" , "Daughter of a sibling" , "A younger female relative" , "Female family member" .)

I've seen this clue in The Times and The Sunday Times.
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