Sheer, the Parisian tower (7)
I believe the answer is:
steeple
'tower' is the definition.
(steeple is a kind of tower)
'sheer the parisian' is the wordplay.
'sheer' becomes 'steep' ('steep' can be similar in meaning to 'sheer').
'the parisian' becomes 'le' (definite article in French).
'steep'+'le'='STEEPLE'
(Other definitions for steeple that I've seen before include "Tall building" , "Pointed church tower" , "Sort of chase" , "part of church" , "Jack up this?" .)