Crossword Genius

Chalice man split unthinking (10)

Ross

I believe the answer is:

mechanical

'unthinking' is the definition.
(thesaurus)

'chalice man split' is the wordplay.
'split' indicates an anagram (letters split up and reassembled).
'chalice'+'man'='chaliceman'
'chaliceman' anagrammed gives 'MECHANICAL'.

(Other definitions for mechanical that I've seen before include "Machine-like" , "Lacking thought or spontaneity" , "Robotic" , "Bottom perhaps" , "Automatic" .)

I've seen this clue in The Globe and Mail.
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