One taking lascivious look round church? (6)
I believe the answer is:
lecher
'one taking lascivious' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'look round church?' is the wordplay.
'look' becomes 'leer' (leering is a kind of looking).
'round' means one lot of letters goes inside another.
'church?' becomes 'ch' (common abbreviation).
'leer' placed around 'ch' is 'LECHER'.
Can you help me to learn more?
(Other definitions for lecher that I've seen before include "He's obsessed with sex" , "Promiscuous chap" , "Person of unrestrained sexual desires" , "Libertine" .)