Request, in snow, is hard (4)

I believe the answer is:

wish

'request' is the definition.
(I know that wish is a more specific form of order)

'in snow is hard' is the wordplay.
'in' indicates a hidden word.
'WISH' is hidden within 'snow is hard'.

(Other definitions for wish that I've seen before include "whim" , "prayer" , "Express a desire (upon a star?)" , "bid" , "Desire (to pull this bone?)" .)

I've seen this clue in The Daily Express.

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