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They may well ruin a sea trip (7)

Ross

I believe the answer is:

pirates

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'they may well' is the definition.
The definition suggests an adverb but the answer is not.

'ruin a sea trip' is the wordplay.
'ruin' indicates an anagram.
'sea'+'trip'='seatrip'
'seatrip' is an anagram of 'PIRATES'.

Can you help me to learn more?

(Other definitions for pirates that I've seen before include "Sea trip (anag.)" , "Chatters, talks foolishly" , "Buccaneers" , "Robbers on the high seas" , "Copies" .)

I've seen this clue in The Globe and Mail.
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