Crossword Genius

Quarantine, to a lion, is criminal (9)

Ross

I believe the answer is:

isolation

'quarantine' is the definition.
(thesaurus)

'to a lion is criminal' is the wordplay.
'criminal' is an anagram indicator.
'to'+'a'+'lion'+'is'='toalionis'
'toalionis' with letters rearranged gives 'ISOLATION'.

(Other definitions for isolation that I've seen before include "Man could display this" , "State of separation, closing off" , "Quarantine; solitude" , "Detachment" , "loneliness" .)

I've seen this clue in The Telegraph.
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