Allow nettle to grow wild around island (7)
I believe the answer is:
entitle
'allow' is the definition.
(I've seen this before)
'nettle to grow wild around island' is the wordplay.
'to grow wild' is an anagram indicator (I've seen 'growing wild' mean this).
'around' is an insertion indicator.
'island' becomes 'i' (geographical abbreviation).
'nettle' with letters rearranged gives 'enttle'.
'enttle' going around 'i' is 'ENTITLE'.
(Other definitions for entitle that I've seen before include "Warrant" , "term" , "Name, authorise" , "Furnish with a right or claim" , "Name; enable" .)