Bounder displaying vigour by day (5)
I believe the answer is:
eland
'bounder' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'vigour by day' is the wordplay.
'vigour' becomes 'elan' (I've seen this before).
'by' says to put letters next to each other.
'day' becomes 'd' (abbreviation for day).
'elan'+'d'='ELAND'
'displaying' acts as a link.
Can you help me to learn more?
(Other definitions for eland that I've seen before include "Spiral-horn antelope" , "Browser" , "South African antelope" , "Ruminant" , "wild creature" .)