Live in hitherto untouched tower (7)
I believe the answer is:
minaret
'tower' is the definition.
(minaret is a kind of tower)
'live in hitherto untouched' is the wordplay.
'live' becomes 'are' (both can mean exist).
'in' indicates putting letters inside.
'hitherto untouched' becomes 'mint' (mint can mean in untouched or perfect condition).
'are' going inside 'mint' is 'MINARET'.
(Other definitions for minaret that I've seen before include "Slender mosque tower" , "tower in Istanbul, say" , "tower in the Middle East" , "Mosque turret" , "Building" .)