Crossword Genius

Twisted wire could be a danger to riverboats (4)

Ross

I believe the answer is:

weir

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

'be a danger to riverboats' is the definition.
I can't tell whether this definition defines the answer.

'twisted wire' is the wordplay.
'twisted' indicates an anagram.
'wire' anagrammed gives 'WEIR'.

'could' acts as a link.

Can you help me to learn more?

(Other definitions for weir that I've seen before include "Small dam built across river to regulate flow" , "Barrier" , "Low dam across a river" , "Dam on a stream to control water level or flow" , "fish may be trapped in this enclosure" .)

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