It covers bishop experiencing tension in difficult situation (5)
I believe the answer is:
mitre
'it covers bishop experiencing' is the definition.
The definition suggests a singular noun which matches the answer.
'tension in difficult situation' is the wordplay.
'tension' becomes 't' (abbreviation for surface tension).
'in' means one lot of letters goes inside another.
'difficult situation' becomes 'mire'.
't' going into 'mire' is 'MITRE'.
Can you help me to learn more?
(Other definitions for mitre that I've seen before include "Corner joint - bishop's headdress" , "Episcopal headdress" , "bishop's head?" , "Sort of joint" , "Clerical coverage" .)