Crossword Genius

Possibly relaying by runner (8)

Ross

I believe the answer is:

yearling

'runner' is the definition.
(young race horse, something which runs)

'possibly relaying' is the wordplay.
'possibly' indicates anagramming the letters.
'relaying' is an anagram of 'YEARLING'.

'by' acts as a link.

(Other definitions for yearling that I've seen before include "Animal between 1 and 2 in age" , "Young horse" , "Animal aged one" , "Animal 12 months old" , "Young filly, perhaps" .)

I've seen this clue in the Evening Standard.
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