Nut from Cape, extraordinary one at heart (5)
I believe the answer is:
pecan
'nut' is the definition.
(type of nut)
'cape extraordinary one at heart' is the wordplay.
'extraordinary' indicates anagramming the letters.
'at heart' means to look at the middle letters.
The central letter of 'one' is 'n'.
'cape' anagrammed gives 'peca'.
'peca'+'n'='PECAN'
'from' is the link.
(Other definitions for pecan that I've seen before include "Nut of American hickory tree" , "Something like a walnut" , "Nut with sweet oily kernel" , "Oval nut of south central United States" , "Smooth pinkish-brown nut, nice in pie" .)