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Mostly
where
soldiers
are
trained
to
place
their
trust
(2,7)
Mostly where soldiers are trained to place their trust (2,7)
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The definition is at the beginning of the clue.
How the clue works
This is a cryptic definition where Mostly gives the sense of IN GENERAL (as in generally, for the most part). The rest of the clue is a whimsical misdirection: soldiers being trained to place their trust 'in [a] general' cheekily points at the same phrase, but there's no separate wordplay to piece together.