Pleased oil's produced with island flowers (8)
I believe the answer is:
gladioli
'flowers' is the definition.
(I've seen this before)
'pleased oil's produced with island' is the wordplay.
'pleased' becomes 'glad' (similar in meaning).
'produced with' is an anagram indicator.
'island' becomes 'i' (geographical abbreviation).
'oil' anagrammed with 'i' makes 'ioli'.
'glad'+'ioli'='GLADIOLI'
(Other definitions for gladioli that I've seen before include "Garden flowers of the iris family" , "I laid log in the flowers" , "Plants with tall flower spikes" , "Some of Iris's family" , "Plant with brightly coloured, funnel-shaped flowers" .)