What the Severn has, and maybe the Ebro (4)

I believe the answer is:

bore

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'what the severn has' is the definition.
I can't judge whether this definition defines the answer.

'maybe the ebro' is the wordplay.
'maybe' indicates anagramming the letters.
'ebro' with letters rearranged gives 'BORE'.

'and' acts as a link.

Can you help me to learn more?

(Other definitions for bore that I've seen before include "Push through a crowd" , "Weary with tediousness" , "Drill to be tiresome" , "Diameter of a gun barrel" , "Wearisome person" .)

I've seen this clue in the Evening Standard.

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