Got over thematically lacking river! (6)

I believe the answer is:

forded

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'got over' is the definition.
(fording is a kind of getting over)

I can't explain the remainder of the clue.

(Other definitions for forded that I've seen before include "Crossed river on foot at shallow place" , "Crossed river at shallow point" .)

I've seen this clue in The Irish Times.

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