Crossword Genius

Much more than decimate! (5)

Ross

I believe the answer is:

halve

I'm a little stuck... Click here to teach me more about this clue!

'decimate' is the definition.
Although both the answer and definition are verbs in their base form, I don't see how one could define the other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for halve that I've seen before include "make 10 5 say?" , "cut by fifty percent" , "split 50/50" , "Bisect" , "Reduce by 50%" .)

I've seen this clue in the Evening Standard.
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