Crossword Genius

Being dogmatic about the relinquishing of arms? (6,4)

Ross

I believe the answer is:

laying down

I'm a little stuck... Click here to teach me more about this clue!

'relinquishing of arms?' is the definition.
Although both the answer and definition are present participle verbs, I cannot understand how one could define the other.

'being dogmatic about the' is the wordplay.
I cannot really understand how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is located in the answer.
The remaining letters 'lyingdown' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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