Columbine is seen in islands without support in water (9)
I believe the answer is:
aquilegia
'columbine' is the definition.
(synonyms)
'is seen in islands without support in water' is the wordplay.
I cannot really understand how this works, but
'support' could be 'leg' (leg is a kind of support) and 'leg' is present in the answer.
'is' could be 'ii' (more than one I) and 'ii' is present in the leftover letters.
'water' could be 'aqua' (I've seen this in another clue) and 'aqua' is found within the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for aquilegia that I've seen before include "Bloomer" , "Showy flower, also known as columbine" , "Flowering plant" , "Plant also known as Granny's Bonnet" .)