Trance takes pastor before lake (7)
I believe the answer is:
reverie
'trance' is the definition.
(thesaurus)
'pastor before lake' is the wordplay.
'pastor before' becomes 'rev' (I am not sure about this - if you are sure you should believe this answer much more).
'lake' becomes 'erie' (Lake Erie is one of the Canadian/US 'Great Lakes').
'rev'+'erie'='REVERIE'
'takes' acts as a link.
Can you help me to learn more?
(Other definitions for reverie that I've seen before include "Aimless train of thought" , "I revere in daydream" , "Daydream, meditation" , "daydreaming" , "Daydream or preoccupation" .)