Proportion in the grip of lethal force (4)

I believe the answer is:

half

I'm a little stuck... Click here to teach me more about this clue!

'proportion in the grip' is the definition.
'half' can be an answer for 'proportion' (I've seen this before). I'm not sure about the 'in the grip' bit.

'of lethal force' is the wordplay.
'of' indicates a hidden word.
'HALF' can be found hidden inside 'lethal force'.

Can you help me to learn more?

(Other definitions for half that I've seen before include "Short distance - steal!" , "Measure of beer" , "0.5" , "One of two equal parts" , "shared round" .)

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