Fuddy-duddy oddball is around (8)
I believe the answer is:
dinosaur
'fuddy-duddy' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'oddball is around' is the wordplay.
'oddball' is an anagram indicator (I've seen this in other clues).
'is'+'around'='isaround'
'isaround' with letters rearranged gives 'DINOSAUR'.
Can you help me to learn more?
(Other definitions for dinosaur that I've seen before include "Extinct beast" , "Extinct repile" , "Prehistoric monster found on Darius" , "old-fashioned sort" , "Creature no longer" .)