Crossword Genius

A large island so far about to become refuge (7)

Ross

I believe the answer is:

alsatia

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

'refuge' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'a large island so far about' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'island' becomes 'ait' (term for a small island).
'so far' becomes 'as' (I've seen this in other clues).
'about' says the letters should be written in reverse.
'ait'+'as'='aitas'
'aitas' back-to-front is 'satia'.
'a'+'l'+'satia'='ALSATIA'

'to become' is the link.

Can you help me to learn more?

(Other definitions for alsatia that I've seen before include "area around Whitefriars, once" , "place of refuge" , "One-time refuge for criminals" , "London sanctuary once" , "and German shepherds?" .)

I've seen this clue in The Times.
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