Cryptic crossword clue
Lag gets stir? Yes, he’s in need of reform 10

The most common and most likely answer to this crossword clue is the 10 letter word HYSTERESIS

I've seen this crossword clue in The Guardian
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Crossword Answer definitions

HYSTERESIS noun
  1. A property of a system such that an output value is not a strict function of the corresponding input, but also incorporates some lag, delay, or history dependence, and in particular when the response for a decrease in the input variable is different from the response for an increase. For example, a thermostat with a nominal setpoint of 75° might switch the controlled heat source on when the temperature drops below 74°, and off when it rises above 76°.
  2. Magnetic friction in dynamos, by which every reversal of magnetism in the iron causes dissipation of energy.

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