Cord I used for an architectural style (5)
I believe the answer is:
doric
'an architectural style' is the definition.
(I've seen this in another clue)
'cord i used' is the wordplay.
'used' indicates anagramming the letters.
'cord'+'i'='cordi'
'cordi' anagrammed gives 'DORIC'.
'for' is the link.
(Other definitions for doric that I've seen before include "One of the Greek orders of architecture" , "Architectural style of Ancient Greece" , "hairdo tips costly, for the most part" , "Plainest order of Gk. architecture" , "Greek architectural style" .)