A trial for a rope (6)

I believe the answer is:

lariat

I'm a little stuck... Click here to teach me more about this clue!

'for a rope' is the definition.
(lariat is a kind of rope)

'a trial' is the wordplay.
'a trial' anagrams to 'LARIAT'.
Though, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for lariat that I've seen before include "Mortar-spreading tool" , "Rope for the cowboy" , "Tethering rope" , "Long noosed rope used to catch animals" , "Long noosed rope for catching animals" .)

I've seen this clue in the Sydney Morning Herald.

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