Show respect when describing a bishop's burial mound (6)
I believe the answer is:
barrow
'burial mound' is the definition.
(ancient burial mound)
'show respect when describing a bishop's' is the wordplay.
'show respect when' becomes 'bow' (I can't justify this - if you can you should believe this answer much more).
'describing' means one lot of letters goes inside another (describe can mean to form the outline of).
'bishop' becomes 'rr' (abbreviation for Right Reverend).
'a'+'rr'='arr'
'bow' enclosing 'arr' is 'BARROW'.
Can you help me to learn more?
(Other definitions for barrow that I've seen before include "Cart used by street vendor" , "One-wheeled handcart" , "Cart for one of the three sisters" , "where items are sold" , "such as street-trader might have?" .)