Half of Yosemite (4)

I believe the answer is:

semi

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

'of yosemite' is the wordplay.
'of' indicates a hidden word.
'SEMI' is hidden within 'yosemite'.

(Other definitions for semi that I've seen before include "Not detached house" , "The next to final round" , "House; match" , "important match" , "Style of house" .)

I've seen this clue in the Evening Standard.

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