… for example, prompt to tour Benin's capital (4)
I believe the answer is:
cube
'for example' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'prompt to tour benin's capital' is the wordplay.
'prompt' becomes 'cue' (cue can mean a prompt or signal).
'to tour' means one lot of letters goes inside another (to tour can mean to go around).
'capital' indicates taking the first letters.
The initial letter of 'benins' is 'b'.
'cue' going around 'b' is 'CUBE'.
Can you help me to learn more?
(Other definitions for cube that I've seen before include "Three-dimensional square" , "In maths, the third power of a quantity" , "Cut into solid squares" , "Solid body with six equal square faces" , "Item as dice, sugar-lump" .)