Crafty part of researches (4)

I believe the answer is:

arch

'crafty' is the definition.
(I've seen this in another clue)

'part of researches' is the wordplay.
'part of' indicates a hidden word.
'ARCH' is hidden within 'researches'.

(Other definitions for arch that I've seen before include "Bridge span" , "Coyly playful" , "Chief: crafty" , "Teasing; part of foot" , "Leading figures" .)

I've seen this clue in The Telegraph.

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