I will enter church or part of cathedral (5)
I believe the answer is:
choir
'cathedral' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'i will enter church or' is the wordplay.
'will enter' indicates putting letters inside.
'church' becomes 'ch' (abbreviation on maps etc).
'ch'+'or'='chor'
'i' inserted inside 'chor' is 'CHOIR'.
'part of' acts as a link.
Can you help me to learn more?
(Other definitions for choir that I've seen before include "warblers" , "set of singers" , "People in church" , "Body of singers" , "Vocal group" .)