Optical outcome of a wild stare? (5)

I believe the answer is:

tears

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'optical outcome' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'a wild stare?' is the wordplay.
'a wild' indicates an anagram.
'stare' anagrammed gives 'TEARS'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for tears that I've seen before include "Rips with signs of sorrow" , "Signs of unhappiness" , "Shed them and cry" , "Lacrimal drops" , "Rush special" .)

I've seen this clue in the Evening Standard.

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