Will trial with a group of chaps lead to trouble? (9)

I believe the answer is:

testament

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'will' is the definition.
('testament' can be a synonym of 'will')

'trial with a group of chaps lead to trouble?' is the wordplay.
'trial' becomes 'test' ('test' can be a synonym of 'trial').
'with' is a charade indicator (letters next to each other).
'a group of chaps' becomes 'amen' (I can't justify this - if you can you should believe this answer much more).
'lead to' indicates taking the first letters.
The initial letter of 'trouble' is 't'.
'test'+'amen'+'t'='TESTAMENT'

Can you help me to learn more?

(Other definitions for testament that I've seen before include "Proof" , "(Person's) will" , "Scripture" , "Will - part of bible" , "document" .)

I've seen this clue in The Independent.

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