Conclude dude confused at church (6)
I believe the answer is:
deduce
'conclude' is the definition.
(deducing is a kind of concluding)
'dude confused at church' is the wordplay.
'confused' indicates anagramming the letters.
'at' is a charade indicator (letters next to each other).
'church' becomes 'CE' (abbreviation for Church of England).
'dude' is an anagram of 'dedu'.
'dedu'+'ce'='DEDUCE'
(Other definitions for deduce that I've seen before include "Arrive at conclusion through reasoning, as Sherlock Holmes did" , "Reason through logic" , "Arrive at reasoned conclusion from facts" , "Work out" , "Derive by reasoning" .)