Crossword Genius

Irish city gettin' twice as big, we hear (6)

Ross

I believe the answer is:

dublin

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

'irish city' is the definition.
(I've seen this before)

'gettin' twice as big we hear' is the wordplay.
I cannot really see how this works, but
'as' could be 'in' (I've seen this in other clues) and 'in' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for dublin that I've seen before include "Capital of Eire" , "Ulysses city (Joyce)" , "Capital of 8" , "Irish capital city" , "City on the Liffey" .)

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