Devon temples demolished for housing estates? (12)
I believe the answer is:
developments
'housing estates?' is the definition.
(as in a housing development)
'devon temples demolished' is the wordplay.
'demolished' is an anagram indicator.
'devon'+'temples'='devontemples'
'devontemples' anagrammed gives 'DEVELOPMENTS'.
'for' acts as a link.
(Other definitions for developments that I've seen before include "MTD envelopes (anag.)" , "Progressive changes" , "Stages of progress" , "Evolutions" , "Move Len's dept (anag.)" .)