Perform stuff from Quince in Globe ... it holds up entrance (8)
I believe the answer is:
doorjamb
'it holds up entrance' is the definition.
The definition suggests a singular noun which matches the answer.
'perform stuff from quince in globe' is the wordplay.
'perform' becomes 'do' (both can mean complete an action).
'stuff from quince' becomes 'jam' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'globe' becomes 'orb' (synonyms).
'jam' put inside 'orb' is 'orjamb'.
'do'+'orjamb'='DOORJAMB'
Can you help me to learn more?
(Other definitions for doorjamb that I've seen before include "Post beside entrance" , "Vertical post by entrance" , "Side post at entrance" , "Side of an entrance's framework" , "Entranceway post" .)