Ruminant raised stout-hearted quokka (6)
I believe the answer is:
reebok
'ruminant' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I can't see?
'raised stout-hearted quokka' is the wordplay.
'raised' shows that the letters should be reversed in order (going up in a down clue).
'stout' becomes 'beer'.
'hearted' says to take the centre.
The centre of 'quokka' is 'ok'.
'beer' backwards is 'reeb'.
'reeb'+'ok'='REEBOK'
Can you help me to learn more?
(Other definitions for reebok that I've seen before include "African runner" , "Antelope of southern Africa" , "South African animal" , "South African antelope (E, not H)" .)