Bit of blood on television (6)

I believe the answer is:

plasma

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'blood on television' is the definition.
'plasma' can be an answer for 'blood' (thesaurus). I am unsure of the 'on television' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for plasma that I've seen before include "Screens of some TVs" , "Colourless fluid in which blood cells are suspended" , "Ionised gas; fluid in blood" , "Part of blood; ionised material" , "A psalm (anag.)" .)

I've seen this clue in The Mirror.

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