Crossword Genius

Safe after a struggle to truss enemy up, relax (4,3)

Ross

I believe the answer is:

ease off

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'relax' is the definition.
(both can mean to reduce in intensity)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ease off that I've seen before include "Slacken gradually" , "Slow down" , "Let up" , "Throttle back" , "Put the brake on" .)

I've seen this clue in The Guardian.
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