Frame a chart I've redesigned around capital in Reykjavik (10)
I believe the answer is:
architrave
'frame' is the definition.
(I've seen this before)
'a chart i've redesigned around capital in reykjavik' is the wordplay.
'redesigned' indicates an anagram.
'around' means one lot of letters goes inside another.
'capital in' says to take the initial letters.
The first letter of 'reykjavik' is 'r'.
'a'+'chart'+'ive'='achartive'
'achartive' with letters rearranged gives 'architave'.
'architave' enclosing 'r' is 'ARCHITRAVE'.
(Other definitions for architrave that I've seen before include "Architectural feature" , "Beam" , "Type of frame" , "this is carried across several columns" , "Frame for door or window" .)