Crossword Genius

Cutting back on heartlessly supporting power (7)

Ross

I believe the answer is:

pruning

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'cutting back' is the definition.
('prune' can be a synonym of 'cut back')

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for pruning that I've seen is " Trimming (trees)".)

I've seen this clue in The Times.
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