Describing this turn made surprisingly? (8)

I believe the answer is:

undreamt

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'describing' is the definition.
The definition and answer are not the same part of speech.

'turn made surprisingly?' is the wordplay.
'surprisingly?' indicates an anagram (a surprising ordering of the letters).
'turn'+'made'='turnmade'
'turnmade' anagrammed gives 'UNDREAMT'.

'this' acts as a link.

Can you help me to learn more?

(Another definition for undreamt that I've seen is " Unforeseen".)

I've seen this clue in The Times.

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