Jumpers perspire on ending the higher jumps (8)
I believe the answer is:
sweaters
'jumpers' is the definition.
(I know this)
'perspire on ending the higher jumps' is the wordplay.
'perspire' becomes 'sweat' (synonyms).
'on' says to put letters next to each other.
'ending' says to take the final letters.
'higher jumps' becomes 'rs' (I can't justify this - if you can you should give a lot more credence to this answer).
The last letter of 'the' is 'e'.
'sweat'+'e'+'rs'='SWEATERS'
Can you help me to learn more?
(Other definitions for sweaters that I've seen before include "Jumpers or pullovers - make you perspire" , "Jerseys, pullovers" , "Knitted upper garments" .)