Vegetable feature found in unknown ICU configuration (8)
I believe the answer is:
zucchini
'vegetable' is the definition.
(zucchini is a kind of vegetable)
'feature found in unknown icu configuration' is the wordplay.
'feature' becomes 'chin' (chin is a kind of feature).
'found in' means one lot of letters goes inside another.
'unknown' becomes 'z' (algebra).
'configuration' is an anagram indicator.
'z'+'icu'='zicu'
'zicu' anagrammed gives 'zuci'.
'chin' going within 'zuci' is 'ZUCCHINI'.
(Other definitions for zucchini that I've seen before include "Courgette in North America" , "US vegetable" , "American courgette" , "Courgette (US)" , "green" .)