Chance to visit Doris following competition? (4,3)
I believe the answer is:
open day
'chance to visit' is the definition.
I can't judge whether this definition defines the answer.
'doris following competition?' is the wordplay.
'doris' becomes 'Day' (actress Doris Day is an example).
'following' is a charade indicator (letters next to each other).
'competition?' becomes 'open' (open is a kind of competition).
'day' put after 'open' is 'OPEN DAY'.
Can you help me to learn more?
(Other definitions for open day that I've seen before include "often held by institution" , "When public may visit, eg, school" , "Free access time" , "Opportunity for public to visit" , "possible to look freely round now" .)