Tower spelt wrong including double E (7)
I believe the answer is:
steeple
'tower' is the definition.
(steeple is a kind of tower)
'spelt wrong including double e' is the wordplay.
'wrong' is an anagram indicator.
'including' is an insertion indicator.
'double' indicates the doubling of some letters.
'spelt' with letters rearranged gives 'stple'.
'e' duplicated is 'ee'.
'stple' placed around 'ee' is 'STEEPLE'.
(Other definitions for steeple that I've seen before include "that the church may be under" , "Jack up this?" , "Sort of chase" , "Tall tower with spire on top of church" , "Tall building" .)