Covered entrance I start to construct in Iberian city (7)
I believe the answer is:
portico
'covered entrance' is the definition.
(I've seen this before)
'i start to construct in iberian city' is the wordplay.
'start to' says to take the initial letters.
'in' indicates putting letters inside.
'iberian city' becomes 'porto' (Portuguese city**).
The first letter of 'construct' is 'c'.
'i'+'c'='ic'
'ic' placed into 'porto' is 'PORTICO'.
(Other definitions for portico that I've seen before include "Colonnade in front of a building" , "A number of columns" , "Classical porch" , "covered area" , "gallery, perhaps" .)