Crossword Genius

Show an alternative spelling (4)

Ross

I believe the answer is:

shew

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

'show' is the definition.
(I know that show can be written as shew)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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