London and SE might be OK, somehow (3,3,5)
I believe the answer is:
the big smoke
'london' is the definition.
(I've seen this before)
'se might be ok somehow' is the wordplay.
'somehow' indicates an anagram.
'se'+'might'+'be'+'ok'='semightbeok'
'semightbeok' with letters rearranged gives 'THE BIG SMOKE'.
'and' acts as a link.
(Other definitions for the big smoke that I've seen before include "Perfecto, perhaps" , "Name given to London" .)