Swinger to make love with Romeo (4)
I believe the answer is:
door
'swinger' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'make love with romeo' is the wordplay.
'make' becomes 'do' (do can mean to make or prepare).
'love' becomes 'o' (love means zero in tennis).
'with' says to put letters next to each other.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'do'+'o'+'r'='DOOR'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for door that I've seen before include "Means of exit and entrance" , "place of entry" , "Threshold" , "Entrance to room, house etc" , "Entrance barrier" .)