Unsound views? I go wild writing about them (7)

I believe the answer is:

mirages

'unsound views?' is the definition.
(a mirage is an illusory image or view)

'i go wild writing about them' is the wordplay.
'go wild' becomes 'rage'.
'writing' becomes 'ms' (abbreviation for manuscript).
'about them' means one lot of letters goes inside another.
'i'+'rage'='irage'
'irage' placed into 'ms' is 'MIRAGES'.

(Another definition for mirages that I've seen is " Optical illusions in hot places".)

I've seen this clue in The Guardian.

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