Pleased with oil I cooked up for plants (8)
I believe the answer is:
gladioli
'plants' is the definition.
The answer is an example.
'pleased with oil i cooked up' is the wordplay.
'pleased' becomes 'glad' (similar in meaning).
'with' says to put letters next to each other.
'cooked up' is an anagram indicator.
'oil'+'i'='oili'
'oili' with letters rearranged gives 'ioli'.
'glad'+'ioli'='GLADIOLI'
'for' acts as a link.
(Other definitions for gladioli that I've seen before include "I laid log in the flowers" , "Garden flowers of the iris family" , "Did the Iliad log out these flowers?" , "Some of Iris's family" , "Plants with tall flower spikes" .)