Scientific study of the body's defence mechanisms (10)
I believe the answer is:
immunology
'scientific study' is the definition.
'immunology' can be an answer for 'study' (immunology is a kind of study). I'm not sure about the 'scientific' bit.
I don't understand the remainder of the clue.
Can you help me to learn more?
I've seen this clue in The Times.
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