This chap is too disturbed (9)

I believe the answer is:

sociopath

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'this' is the definition.
The definition suggests a singular noun which matches the answer.

'chap is too disturbed' is the wordplay.
'disturbed' is an anagram indicator (the order of letters is disturbed).
'chap'+'is'+'too'='chapistoo'
'chapistoo' is an anagram of 'SOCIOPATH'.

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(Other definitions for sociopath that I've seen before include "dangerous individual" , "Antisocial being" , "Psycho" , "One who's disturbed" .)

I've seen this clue in The Independent.

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