Algae isn't a disaster in fenland region (4,6)
I believe the answer is:
east anglia
'fenland region' is the definition.
'algae isn't a disaster' is the wordplay.
'disaster' indicates an anagram.
'algae'+'isnt'+'a'='algaeisnta'
'algaeisnta' anagrammed gives 'EAST ANGLIA'.
'in' is the link.
(Other definitions for east anglia that I've seen before include "Norfolk, Suffolk, part of Essex and Cambridgeshire" , "Area of England" , "part of England" , "UK region" , "English region" .)