Partial text remains source for mathematical values (7)
I believe the answer is:
extrema
'mathematical values' is the definition.
Although both the answer and definition are plural nouns, I can't understand how one could define the other.
'partial text remains source' is the wordplay.
'partial' indicates a hidden word.
'EXTREMA' can be found hidden inside 'text remains source'.
'for' is the link.
Can you help me to learn more?
(Another definition for extrema that I've seen is " Furthest points".)
I've seen this clue in The Guardian.
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