Disreputable organisation linked to noble (8)

I believe the answer is:

unworthy

'disreputable' is the definition.
(thesaurus)

'organisation linked to noble' is the wordplay.
'organisation' becomes 'un' (UN is an example).
'linked to' says to put letters next to each other.
'noble' becomes 'worthy' ('worthy' can be a synonym of 'noble'**).
'un'+'worthy'='UNWORTHY'

(Other definitions for unworthy that I've seen before include "Not good enough" , "Not deserving or suitable for something" , "Undeserving" , "Disreputable" , "base" .)

I've seen this clue in the Irish Times, the Irish Times (Crosaire) and The Sun.

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