Optical illusions (7)
I believe the answer is:
mirages
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">optical illusions</span>' is the definition.<br/ ><span class="explanation-format__explanation">(mirage is a kind of optical illusion)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Another definition for mirages that I've seen is " Optical illusions in hot places".)
I've seen this clue in the Sydney Morning Herald.
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