Those dabbling in wetlands could be troubled least (5)

I believe the answer is:

teals

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'those dabbling in wetlands could' is the definition.
I can't tell whether this defines the answer.

'troubled least' is the wordplay.
'troubled' is an anagram indicator.
'least' with letters rearranged gives 'TEALS'.

'be' is the link.

Can you help me to learn more?

(Another definition for teals that I've seen is " Small ducks".)

I've seen this clue in The Times.

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