Bet I'd be worried as water drops (7)

I believe the answer is:

ebbtide

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'water drops' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'bet i'd be worried' is the wordplay.
'worried' indicates anagramming the letters.
'bet'+'id'+'be'='betidbe'
'betidbe' anagrammed gives 'EBBTIDE'.

'as' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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