Rex is given approval for an alternative to sushi? (5)

I believe the answer is:

ramen

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'an alternative to sushi?' is the definition.
I know nothing about this answer so I can't judge whether this works.

'rex is given approval' is the wordplay.
'rex' becomes 'R' (abbreviation e.g. GR=George Rex, King George).
'is given' means one lot of letters go next to another.
'approval' becomes 'amen' (I've seen this in another clue).
'r'+'amen'='RAMEN'

'for' is the link.

Can you help me to learn more?

(Other definitions for ramen that I've seen before include "Oriental noodles" , "Exotic dish" , "Quick-cooking noodles" , "soup" .)

I've seen this clue in The Independent.

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