Vineyard hacked out of scrub (3)

I believe the answer is:

cru

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

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

'hacked out of scrub' is the wordplay.
'CRU' is hidden in amongst the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for cru that I've seen before include "Growth place of a French wine" , "French vineyard (and the wine from it)" , "Source of wine" , "Superior vineyard" , "Vineyard or group of them in France" .)

I've seen this clue in The Times.

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