Torque unit can vary and it can restrict flow (10)

I believe the answer is:

tourniquet

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'vary and it can restrict flow' is the definition.
I can't judge whether this definition defines the answer.

'torque unit can' is the wordplay.
'can' is an anagram indicator (I've seen 'canned' mean this (canned can mean drunk)).
'torque'+'unit'='torqueunit'
'torqueunit' with letters rearranged gives 'TOURNIQUET'.

Can you help me to learn more?

(Other definitions for tourniquet that I've seen before include "Blood flow stopper" , "bleeding controller!" , "medical treatment" , "Device for stopping blood flow" , "Blood-staunching compressor" .)

I've seen this clue in The Independent.

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