Will have a try at capturing the soldiers (9)

I believe the answer is:

testament

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'will' is the definition.
(synonyms)

'have a try at capturing the soldiers' is the wordplay.
'have a try' becomes 'test' (I can't explain this - if you can you should give a lot more credence to this answer).
'capturing' is an insertion indicator.
'the soldiers' becomes 'men' (men can mean a group of soldiers).
'at' going around 'men' is 'ament'.
'test'+'ament'='TESTAMENT'

Can you help me to learn more?

(Other definitions for testament that I've seen before include "with 1a [NEW] where is Mark?" , "Biblical division" , "Will - covenant" , "document" , "Will or solemn declaration" .)

I've seen this clue in the Evening Standard.

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