Tower encountered round about Iran (7)
I believe the answer is:
minaret
'tower' is the definition.
(I know that minaret is a type of tower)
'encountered round about iran' is the wordplay.
'encountered' becomes 'met' ('meet' can be a synonym of 'encounter').
'round' indicates putting letters inside.
'about' indicates anagramming the letters.
'iran' is an anagram of 'inar'.
'met' placed around 'inar' is 'MINARET'.
(Other definitions for minaret that I've seen before include "Mosque turret" , "Tower from which muezzin calls Muslims to prayer" , "Appropriate raiment for mosque tower" , "Raiment worn on mosque tower" , "religious tower" .)