12 across
Soldiers
hiding
in
plant
of
dark
green
colour
(5)
Soldiers hiding in plant of dark green colour (5)
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How the clue works
Look at the end of the clue: colour is the definition, as ivory is certainly one. For the wordplay, the soldiers are OR (other ranks), and they're hiding inside IVY, the dark green plant, so you get IV-OR-Y with the troops tucked neatly in the middle.