Only part of lethal force (4)

I believe the answer is:

half

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'only part' is the definition.
'half' can be an answer for 'part' (thesaurus). I am not sure about the 'only' bit.

'of lethal force' is the wordplay.
'of' says the answer is hidden in the clue.
'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!" , "0.5" , "alcoholic drink" , "one over a couple" , "Wife the better one (joc.)" .)

I've seen this clue in The Mirror.

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