Crossword Genius

Shrewd hacker no amateur (6)

Ross

I believe the answer is:

clever

'shrewd' is the definition.
(I've seen this in another clue)

'hacker no amateur' is the wordplay.
'hacker' becomes 'cleaver' (blade for hacking at things).
'no' is a deletion indicator.
'amateur' becomes 'a'.
'cleaver' with 'a' removed is 'CLEVER'.

(Other definitions for clever that I've seen before include "Smar and canny" , "Bright; smart" , "Highly intelligent" , "Good or quick at learning" , "Sharp and able" .)

I've seen this clue in The Guardian.
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