Do some maths at first after dinner date (3)
I believe the answer is:
add
'do some maths at first after dinner date' is the definition.
I can't tell whether this defines the answer.
'first after dinner date' is the wordplay.
'first' says to take the initial letters.
The initial letters of 'after dinner date' is 'ADD'.
Can you help me to learn more?
(Other definitions for add that I've seen before include "Augment" , "Count up" , "put two and two together" , "Put together - attach" , "Total; put together" .)