Going up and down as far as Teddington (5)

I believe the answer is:

tidal

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'going up and down' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for tidal that I've seen before include "Relating to ocean surges" , "(Waters) subject to moon/sun" , "going with the flow" , "Like the sea" , "Going back and forth" .)

I've seen this clue in the Evening Standard.

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