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' means one lot of letters goes inside another (inserted letters break into the word).
'show' becomes 'fair' (fair is a kind of show).
'l' placed into '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" .)