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Well cooked crab I ate — it could make one sick (8)

Ross

I believe the answer is:

bacteria

I'm a little stuck... Click here to teach me more about this clue!

'make one sick' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'well cooked crab i ate it' is the wordplay.
'crab i ate' anagrams to 'BACTERIA'.
Though, I am unsure how this is indicated.

'could' acts as a link.

Can you help me to learn more?

(Other definitions for bacteria that I've seen before include "Microscopic organisms, good and bad", "Microorganisms that can cause disease", "Single-celled organisms", "Single-cell organisms, can be good or bad for you", "Infectious microorganisms".)

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