See Anglican cleric entering calmly (6)
I believe the answer is:
evenly
'calmly' is the definition.
(I've seen this before)
'see anglican cleric entering' is the wordplay.
'see' becomes 'ely' (example where cathedral located in diocese).
'anglican cleric' becomes 'ven' (abbreviation for 'The Venerable', religious title).
'entering' indicates putting letters inside.
'ely' going around 'ven' is 'EVENLY'.
(Other definitions for evenly that I've seen before include "on an equal footing" , "constant rate" , "impartial manner" , "Calmly or equitably" , "In level or uniform manner" .)