3 down
No
time
to
contemplate
–
intervene
(7)
No time to contemplate – intervene (7)
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hints
The definition is at the end of the clue.
How the clue works
Look at intervene — that's your definition. You start with MEDITATE (meaning contemplate), then "no time" tells you to drop the T (T being the standard abbreviation for time), and you're left with MEDIATE.