A puce jumper (4)
I believe the answer is:
flea
This might be a double definition.
'a puce' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'jumper' is the second definition.
(something that jumps)
Can you help me to learn more?
(Other definitions for flea that I've seen before include "Insect (which you don't want in your ear!)" , "Jumping parasite" , "Wingless, jumping insect" , "Leaping insect" , "high-jumper" .)