Disturbance of ocean may make gulls wonder (11)
I believe the answer is:
groundswell
'disturbance of ocean' is the definition.
The answer and definition can be both related to natural events as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'make gulls wonder' is the wordplay.
'make' indicates an anagram.
'gulls'+'wonder'='gullswonder'
'gullswonder' is an anagram of 'GROUNDSWELL'.
'may' is the link.
Can you help me to learn more?
(Other definitions for groundswell that I've seen before include "Shift in public opinion" , "gathering movement" , "Build-up of public opinion" , "Strong growth of opinion" , "Forming opinion" .)