Vision curtailed: release breath (4)

I believe the answer is:

sigh

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'release breath' is the definition.
'sigh' can be an answer for 'breath' (I have seen 'Deep breath' mean 'sigh' so perhaps 'breath' could also mean 'sigh'). I'm unsure of the 'release' bit.

'vision curtailed' is the wordplay.
'vision' becomes 'sight' (synonyms).
'curtailed' means to remove the last letter.
'sight' with its final letter taken off is 'SIGH'.

Can you help me to learn more?

(Other definitions for sigh that I've seen before include "Exhale loudly" , "Release a long breath" , "Sound of regret" , "Exhale wearily" , "Express relief or sorrow" .)

I've seen this clue in The Sun.

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