12 across
Maximum
and
minimum
values
taken
out
of
context,
remarkably
(7)
Maximum and minimum values taken out of context, remarkably (7)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
Right, so maximum and minimum values is your definition — that's the maths term for those turning points. Now look at the phrase "contEXT, REMArkably" — "taken out of" is telling you the answer is hiding inside there, just lift it straight out.