Arrange a term in the tower (7)
I believe the answer is:
minaret
'the tower' is the definition.
(minaret is a kind of tower)
'arrange a term in' is the wordplay.
'arrange' is an anagram indicator.
'a'+'term'+'in'='atermin'
'atermin' is an anagram of 'MINARET'.
(Other definitions for minaret that I've seen before include "Raiment worn on mosque tower" , "Mosque spire" , "Tower from which muezzin calls Muslims to prayer" , "Muezzin's tower" , "Tower attached to mosque" .)