Set free, having a strange hunch about it (7)

I believe the answer is:

unhitch

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'set free' is the definition.
'unhitch' can be an answer for 'free' (I've seen this before). I'm unsure of the 'set' bit.

'a strange hunch about it' is the wordplay.
'a strange' indicates an anagram.
'about' is an insertion indicator.
'hunch' is an anagram of 'unhch'.
'unhch' going around 'it' is 'UNHITCH'.

'having' is the link.

Can you help me to learn more?

(Other definitions for unhitch that I've seen before include "Separate" , "Disconnect" , "Release" , "Part" , "Unhook, unfasten" .)

I've seen this clue in the Evening Standard.

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