Crossword Genius

Soldier dropping in? (4)

Ross

I believe the answer is:

para

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'soldier' is the definition.
(paratrooper)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for para that I've seen before include "Airdropped soldier" , "High-jumper" , "abbreviated passage having unity" , "Soldier in an airborne unit" , "Soldier (shortened)" .)

I've seen this clue in The Sun.
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