Crossword Genius

Groggy when felled (4)

Ross

I believe the answer is:

hewn

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'felled' is the definition.
('hewn' can be similar in meaning to 'felled')

'groggy when' is the wordplay.
'when' can be anagrammed to 'HEWN'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for hewn that I've seen before include "Cut with an axe or chisel" , "Axed" , "Cut with blows" , "(Of wood) cut, chopped" , "Shaped as with an axe" .)

I've seen this clue in The Telegraph.
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