Illusory (6)

I think it could be either:

Which length description are you looking for?:

unreal

'illusory' is the definition.
(similar in meaning)

This is the entire clue.

(Other definitions for unreal that I've seen before include "Artificial, insubstantial" , "Not true to life" , "Not actual or credible" , "Phantasmagorical" , "Dreamlike" .)

I've seen this clue in The Guardian, The Telegraph and the Evening Standard.

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