One needs to hop to it to win this competition? (4,4)
I believe the answer is:
sack race
'one needs to hop to it to win this competition?' is the definition.
'sack race' can be an answer for 'competition?' (sack race is a kind of competition). I'm not sure about the remainder of the definition.
'it to win this competition?' is the wordplay.
'it' becomes 'sa' (SA can mean sex appeal, as in 'it').
'to win' becomes 'ck' (I can't justify this - if you can you should believe this answer much more).
'this competition?' becomes 'race' (race is a kind of competition).
'sa'+'ck'+'race'='SACK-RACE'
Can you help me to learn more?
(Other definitions for sack race that I've seen before include "athletics contest" , "'Novelty competition where entrants run with their feet in a bag (4,4)'" , "jumping event" , "Jumping contest" , "Get rid of nation" .)