Redesigned patterns for part of church (8)
I believe the answer is:
transept
'part of church' is the definition.
('transept' is part of 'church')
'redesigned patterns' is the wordplay.
'redesigned' indicates anagramming the letters.
'patterns' with letters rearranged gives 'TRANSEPT'.
'for' is the link.
(Other definitions for transept that I've seen before include "Something dividing church in two" , "Patterns found in parts of church" , "Part of a church at right angles to the nave" , "It crosses the nave in church" , "Cross-aisle in church" .)