Chaotic protests seen at airports and railway stations (8)

I believe the answer is:

spotters

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

'at airports and railway stations' is the definition.
I can't tell whether this defines the answer.

'chaotic protests' is the wordplay.
'chaotic' indicates anagramming the letters.
'protests' is an anagram of 'SPOTTERS'.

'seen' is the link.

Can you help me to learn more?

(Other definitions for spotters that I've seen before include "Plane observers" , "Whale watchers, possibly" , "Military lookouts" .)

I've seen this clue in The Irish Times.

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