Activists regularly snapped at invading European country (10)

I believe the answer is:

greenpeace

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'activists' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'regularly snapped at invading european country' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'invading' indicates putting letters inside.
'european country' becomes 'greece' (country in Europe).
'snapped'+'at'='snappedat'
The alternating letters of 'snappedat' are 'npea'.
'npea' inserted inside 'greece' is 'GREENPEACE'.

Can you help me to learn more?

(Other definitions for greenpeace that I've seen before include "Environmental pressure group" , "Environmentalists" , "Environmental activists' group" , "Environmental campaigners" .)

I've seen this clue in The Guardian.

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