It's a cable that needs to be fixed off the Swedish coast (6,3)
I believe the answer is:
number one
'it's' is the definition.
(thesaurus)
'a cable that needs to be fixed off the swedish coast' is the wordplay.
I cannot really understand how this works, but
'a' could be 'one' and 'one' is found within the answer.
'be' could be 'number' (numbering is a kind of being) and 'number' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for number one that I've seen before include "top-selling record" , "top man?" , "best record" , "Cut" , "Naval first lieutenant; foremost person/thing" .)