Each April go around a group of islands (11)
I believe the answer is:
archipelago
'a group of islands' is the definition.
(I've seen this before)
'each april go around' is the subsidiary indication.
'around' indicates anagramming the letters.
'each'+'april'+'go'='eachaprilgo'
'eachaprilgo' with letters rearranged gives 'archipelago'.
(Other definitions for archipelago that I've seen before include "Bahrain, for one" , "Large group of islands" , "watery domain" , "the Philippines maybe" , "Group of many islands" .)