Person having stock of bacteria for germ warfare — murder, ultimately (6)

I believe the answer is:

farmer

'person having stock' is the definition.
(stock are farm animals)

'of bacteria for germ warfare murder ultimately' is the wordplay.
'ultimately' indicates one should take the final letters.
The last letters of 'of bacteria for germ warfare murder' are 'FARMER'.

(Other definitions for farmer that I've seen before include "Old MacDonald, for example" , "Smallholder, e.g." , "Agricultural manager" , "Ranchero" , "Crop grower or livestock keeper" .)

I've seen this clue in The Times.

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