Joke you are texting about requirement for jumper? (3-2)
I believe the answer is:
run-up
'requirement for jumper?' is the definition.
I can't judge whether this definition defines the answer.
'joke you are texting about' is the wordplay.
'joke' becomes 'pun' (pun is a type of joke).
'you are texting' becomes 'ur' (abbreviation for 'you are' when texting).
'about' says the letters should be written backwards.
'pun'+'ur'='punur'
'punur' back-to-front is 'RUN-UP'.
Can you help me to learn more?
(Other definitions for run-up that I've seen before include "Cricketing approach?" , "Preliminary period" , "Bowler's approach?" , "Approach - preliminaries" .)