Single ray picked out those between one and two (9)
I believe the answer is:
yearlings
'picked out those between one and two' is the definition.
I can't judge whether this definition defines the answer.
'single ray' is the wordplay.
'single ray' anagrams to 'YEARLINGS'.
However, I'm not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for yearlings that I've seen before include "young runners" , "Young horses" , "Racehorses in their second year" .)