Perhaps young Arab left in bed (4)
I believe the answer is:
colt
'perhaps young arab' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'left in bed' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' indicates putting letters inside.
'bed' becomes 'cot' (cot is a kind of bed).
'l' put within 'cot' is 'COLT'.
Can you help me to learn more?
(Other definitions for colt that I've seen before include "Youngster" , "runner" , "pistol" , "Young stallion" , "with a hefty kick?" .)