Crossword Genius

Send packing, possibly (5)

Ross

I believe the answer is:

expel

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'send packing' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for expel that I've seen before include "Banish (undesirable alien?)" , "Put out" , "Drive out - dispossess" , "Throw out" , "Deport" .)

I've seen this clue in the Evening Standard.
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