Local Iron Age construction's closer to hill (8)
I believe the answer is:
regional
'local' is the definition.
(in a particular region)
'iron age construction's closer to hill' is the wordplay.
'construction' is an anagram indicator (answer constructed from certain letters).
'closer to' suggests the final letters (the letter which ends or closes the word).
The last letter of 'hill' is 'l'.
'iron'+'age'='ironage'
'ironage' is an anagram of 'regiona'.
'regiona'+'l'='REGIONAL'
(Other definitions for regional that I've seen before include "From a geographical area" , "of the district" , "Territorial" , "Characteristic of an area" , "Relating to local area" .)