Crossword Genius

Official law is something completely thoughtless (6)

Ross

I believe the answer is:

reflex

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'something completely thoughtless' is the definition.
I can't tell whether this defines the answer.

'official law' is the wordplay.
'official' becomes 'ref' (match official in football, say).
'law' becomes 'lex' (Latin for 'law').
'ref'+'lex'='REFLEX'

'is' is the link.

Can you help me to learn more?

(Other definitions for reflex that I've seen before include "Involuntary (action)" , "Action not requiring conscious thought" , "This action is an automatic response to stimulus" , "Unthinking response" , "Involuntary movement" .)

I've seen this clue in The Independent.
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