Crossword Genius

Inoculation fluids (4)

Ross

I believe the answer is:

sera

'inoculation fluids' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for sera that I've seen before include "Bodily fluids (following 'que'?)" , "Watery liquids" , "Hospital supplies" , "Sear with serums" .)

I've seen this clue in the LA Times.
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