Crossword Genius

Greek cross about a very large area for salmon (7)

Ross

I believe the answer is:

gravlax

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'salmon' is the definition.
(Nordic salmon dish)

'greek cross about a very large area' is the wordplay.
'greek' becomes 'gr' (abbreviation for Greek).
'cross' becomes 'x' (X is cross-shaped).
'about' says to put letters next to each other.
'very large area' becomes 'vla' (this might be a standard abbreviation I've not previously seen).
'a'+'vla'='avla'
'x' after 'avla' is 'avlax'.
'gr'+'avlax'='GRAVLAX'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for gravlax that I've seen before include "Dry-cured salmon" , "Scand. cured salmon" .)

I've seen this clue in The Guardian.
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