Suspect male is captured by devious ruse (7)
I believe the answer is:
surmise
'suspect' is the definition.
('surmise' can be a synonym of 'suspect')
'male is captured by devious ruse' is the wordplay.
'male' becomes 'm' (common abbreviation).
'captured by' is an insertion indicator.
'devious' indicates an anagram.
'm'+'is'='mis'
'ruse' is an anagram of 'sure'.
'mis' inserted within 'sure' is 'SURMISE'.
(Other definitions for surmise that I've seen before include "Conjecture from misuser" , "Suppose without evidence" , "Supposition - guess" , "suspect" , "Speculate about misuser" .)