After reflection, worry about major feature of entrance (8)
I believe the answer is:
doorjamb
'entrance' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'after reflection worry about major feature' is the wordplay.
'after reflection' is a reversal indicator.
'worry' becomes 'brood' (synonyms).
'about' means one lot of letters goes inside another.
'major feature' becomes 'maj' (I can't explain this - if you can you should believe this answer much more).
'brood' placed around 'maj' is 'bmajrood'.
'bmajrood' backwards is 'DOORJAMB'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for doorjamb that I've seen before include "Side-piece at entrance" , "Entrance sidepost" , "Side of an entrance's framework" , "Vertical post by entrance" , "Side post at entrance" .)