Crossword Genius

Finds just the extent of the action taken (8)

Ross

I believe the answer is:

measures

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'finds' is the definition.
The answer and definition can be both acts as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I don't understand the rest of the clue.

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(Other definitions for measures that I've seen before include "Determine the dimensions" , "Steps" , "Finds the length of" , "Ascertains the quantity, extent etc." , "Ascertains the size, of dances?" .)

I've seen this clue in the Evening Standard.
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