Flair seen in Michelangelo's centrepiece (4)
I believe the answer is:
elan
'flair' is the definition.
(I know that flair can be written as elan)
'in michelangelo's centrepiece' is the wordplay.
'in' says the answer is hidden in the clue.
'ELAN' is hidden in the letters of 'michelangelo centrepiece'.
'seen' acts as a link.
(Other definitions for elan that I've seen before include "Dash and enthusiasm." , "Style and liveliness" , "Stylish verve" , "Energy, style and enthusiasm" , "Vivacity, panache" .)