Crossword Genius

Criminal case turned on deeply ingrained habit (6,6)

Ross

I believe the answer is:

second nature

'deeply ingrained habit' is the definition.
(I've seen this before)

'criminal case turned on' is the wordplay.
'criminal' is an anagram indicator.
'case'+'turned'+'on'='caseturnedon'
'caseturnedon' anagrammed gives 'SECOND NATURE'.

(Other definitions for second nature that I've seen before include "Deeply ingrained habit" , "Almost instinctive behaviour" , "Deeply ingrained tendency" , "it's become instinctive" , "Apparently innate behaviour" .)

I've seen this clue in The Telegraph.
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