What has oddly round loop, originally? (5)
I believe the answer is:
whorl
'what has oddly round loop originally?' is the definition.
I can't judge whether this definition defines the answer.
'what has oddly round loop originally?' is the wordplay.
'originally?' suggests taking the first letters (I've seen 'originally' mean this).
The first letters of 'what has oddly round loop' is 'WHORL'.
Can you help me to learn more?
(Other definitions for whorl that I've seen before include "A turn in a spiral shell" , "Pattern in a fingerprint" , "Helix" , "Loopy shape" , "Fingerprint circle" .)