Could be nine seas in tumult (2,1,5)
I believe the answer is:
in a sense
'could be nine seas in tumult' is the definition.
I can't judge whether this defines the answer.
'could be nine seas' is the wordplay.
'could be' indicates an anagram.
'nine'+'seas'='nineseas'
'nineseas' is an anagram of 'IN A SENSE'.
Can you help me to learn more?
(Other definitions for in a sense that I've seen before include "After a fashion" , "To some extent" , "According to one possible interpretation" .)