Crossword Genius

Extremely sensitive setter cop tickled? (3-6)

Ross

I believe the answer is:

top-secret

'extremely sensitive' is the definition.
(as in highly sensitive information)

'setter cop tickled?' is the wordplay.
'tickled?' is an anagram indicator (I've seen this in other clues).
'setter'+'cop'='settercop'
'settercop' is an anagram of 'TOP-SECRET'.

(Other definitions for top-secret that I've seen before include "Most confidential , not to be leaked on any account" , "Very hush-hush" , "Highly confidential" , "(Of information) strictly not for public consumption" , "Erect post (anag)" .)

I've seen this clue in The Independent.
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