Endless fighting? Popular way to keep blood flowing (8)

I believe the answer is:

warfarin

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'way to keep blood flowing' is the definition.
I can't judge whether this defines the answer.

'endless fighting? popular' is the wordplay.
'endless' means to remove the last letter.
'fighting?' becomes 'warfare' (fighting a war).
'popular' becomes 'in' ('in' can mean trendy).
'warfare' with its final letter removed is 'warfar'.
'warfar'+'in'='WARFARIN'

Can you help me to learn more?

(Other definitions for warfarin that I've seen before include "thinner" , "Pest controller" , "Rat poison - medical anticoagulant" , "Type of poison" , "Blood anticoagulant" .)

I've seen this clue in The Irish Times.

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