Lower seabed removed (6)

I believe the answer is:

debase

'lower' is the definition.
(thesaurus)

'seabed removed' is the wordplay.
'removed' is an anagram indicator (moved again).
'seabed' anagrammed gives 'DEBASE'.

(Other definitions for debase that I've seen before include "Lower in quality, reduce the value of" , "dishonour" , "Degrade or devalue" , "Depreciate or humiliate" , "Degrade or demean" .)

I've seen this clue in The Telegraph.

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