Sculptor, Swiss at heart, came and got it wrong (10)
I believe the answer is:
giacometti
'sculptor' is the definition.
(I've seen this before)
'swiss at heart came and got it wrong' is the wordplay.
'at heart' indicates the central letters.
'and' means one lot of letters go next to another.
'wrong' indicates anagramming the letters.
The middle of 'swiss' is 'i'.
'i'+'came'+'got'+'it'='icamegotit'
'icamegotit' with letters rearranged gives 'GIACOMETTI'.
(Other definitions for giacometti that I've seen before include "sculptor" , "Swiss-born artist known for elongated bronze figures" , "Swiss artist known for spindly figures; tie to magic (anag.)" .)