Crossword Genius

It's simple to deploy army under it (11)


I believe the answer is:


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'it's simple' is the definition.
I can't tell whether this definition defines the answer.

'deploy army under it' is the wordplay.
'deploy' is an anagram indicator (I've seen 'deploying' mean this).
'armyunderit' anagrammed gives 'RUDIMENTARY'.

'to' is the link.

Can you help me to learn more?

(Other definitions for rudimentary that I've seen before include "Undeveloped" , "Primitive" , "Limited to basics" , "Immature" , "Basic" .)

I've seen this clue in The Guardian.
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