Pineapple in garden English cultivated (7)
I believe the answer is:
grenade
'pineapple' is the definition.
(pineapple can informally mean a grenade)
'garden english cultivated' is the wordplay.
'english' becomes 'e' (abbreviation).
'cultivated' indicates anagramming the letters.
'garden'+'e'='gardene'
'gardene' with letters rearranged gives 'GRENADE'.
'in' acts as a link.
(Other definitions for grenade that I've seen before include "Missile thrown" , "Small bomb thrown by hand" , "Bomb with a pin" , "Angered (anag)" , "Small explosive device" .)