Take prompt action at some stage? (7,4,6)

'stage?' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'take prompt action at' is the wordplay.
I cannot really understand how this works, but
'take' could be 'r' (abbreviation for 'recipe', Latin for 'take') and 'r' is located in the answer.
'action' could be 'esm' (ESM is an example) and 'esm' is located in the answer.
'at' could be 'on' (location) and 'on' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

'some' acts as a link.

Can you help me to learn more?