Prefix with type or plasm (5)

I believe the answer is:

proto

'prefix with type or plasm' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for proto that I've seen before include "Denotes the first or earliest" , "Prefix indicating the first, earliest or original" .)

I've seen this clue in the King Feature Syndicate.

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