Prune polo pony grabs (3)

I believe the answer is:

lop

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'prune' is the definition.
(synonyms)

'polo pony grabs' is the wordplay.
'LOP' is hidden in amongst the letters.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for lop that I've seen before include "Cut (e.g. branch off)" , "Chop (off)" , "Hack" , "Cut away branches or twigs" , "Remove branches from a tree" .)

I've seen this clue in The Sun.

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