Crossword Genius

One removing last of haemoglobin from large vessel (5)

Ross

I believe the answer is:

taker

'one removing' is the definition.
(someone who removes or takes things)

I can't explain the remainder of the clue.

(Other definitions for taker that I've seen before include "(Challenge) acceptor" , "Person accepting an offer" , "He accepts" , "Could be a thief" , "one's prepared to bet" .)

I've seen this clue in The Times.
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