Crossword Genius

Explains about constant contributors to immune response (1-5)


I believe the answer is:


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'constant contributors to immune response' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'explains about' is the wordplay.
I cannot really see how this works, but
'about' could be 'c' (circa) and 'c' is found in the answer.
The remaining letters 'tells' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Guardian.
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