Who gives an opening around November 1st? (5)
I believe the answer is:
donor
'who' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'an opening around november 1st?' is the wordplay.
'an opening' becomes 'door' (a door is an opening).
'around' indicates putting letters inside.
'november 1st?' becomes 'n' (1st letter of 'november').
'door' going around 'n' is 'DONOR'.
'gives' acts as a link.
Can you help me to learn more?
(Other definitions for donor that I've seen before include "Almsgiver, benefactor" , "Generous type" , "One giving something" , "Organ giver?" , "A giver, perhaps of blood" .)