Large breaks show talent (5)
I believe the answer is:
flair
'talent' is the definition.
(flair is a kind of talent)
'large breaks show' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'breaks' indicates putting letters inside (inserted letters break into the word).
'show' becomes 'fair' (fair is a kind of show).
'l' placed inside 'fair' is 'FLAIR'.
(Other definitions for flair that I've seen before include "Natural ability to do something well (5)" , "Talent; elegance" , "Stylishness; talent" , "Style, panache" , "Bent" .)