Soldiery's top-level threat (6)

I believe the answer is:

menace

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'level threat' is the definition.
'menace' can be an answer for 'threat' (synonyms). I'm unsure of the 'level' bit.

'soldiery's top' is the wordplay.
'soldiery's' becomes 'men' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'top' becomes 'ace'.
'men'+'ace'='MENACE'

Can you help me to learn more?

(Other definitions for menace that I've seen before include "Threaten with harm or danger" , "Serious threat" , "Act in a threatening manner" , "Harmful person" , "A source of danger" .)

I've seen this clue in The Telegraph.

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