A trail possibly used by a cowboy (6)

I believe the answer is:

lariat

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'a cowboy' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'a trail possibly' is the wordplay.
'possibly' indicates an anagram.
'a'+'trail'='atrail'
'atrail' anagrammed gives 'LARIAT'.

'used by' is the link.

Can you help me to learn more?

(Other definitions for lariat that I've seen before include "Long narrow ditch" , "A cowboy's rope for catching cattle" , "tethering-rope" , "Long rope with a noose at the end" , "Long noosed rope for catching animals" .)

I've seen this clue in the Evening Standard.

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