Jumper is one for man covering large belly in FaceTime (7)
I believe the answer is:
athlete
'jumper' is the definition.
(I have seen 'long jumper' mean 'athlete' so perhaps 'jumper' could also mean 'athlete')
'one for man covering large belly in facetime' is the wordplay.
I cannot quite see how this works, but
'one' could be 'a' (a thing is one thing) and 'a' is found within the answer.
'large' could be 'l' (eg in clothes sizes) and 'l' is present in the answer.
'man' could be 'he' (he refers to a man) and 'he' is located in the leftover letters.
This may be the basis of the clue (or it may be nonsense).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for athlete that I've seen before include "Track performer" , "Sporty type" , "Runner, jumper, thrower" , "Sprinter, say" , "One who engages in physical sports" .)