Pacific ecosystem rumbled North and cut out (8,7)
I believe the answer is:
Here is my best explanation:
'pacific ecosystem' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'rumbled north and cut out' is the wordplay.
'and' is a charade indicator (letters next to each other) (I've seen this in other clues).
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'rumblednorth' put after 'cut' is 'cutrumblednorth'.
'cutrumblednorth' with letters rearranged gives 'HUMBOLDT CURRENT'.