A few accepting guidance for solemn oath (2,4,2)

I believe the answer is:

so help me

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'solemn oath' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'a few accepting guidance' is the wordplay.
'a few' becomes 'some' (I've seen this before).
'accepting' means one lot of letters goes inside another.
'guidance' becomes 'help'.
'some' placed around 'help' is 'SO HELP ME'.

'for' acts as a link.

Can you help me to learn more?

(Another definition for so help me that I've seen is " On my word".)

I've seen this clue in The Times.

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