Piece containing extremes of emotional range (9)
I believe the answer is:
selection
'range' is the definition.
(selection can mean a range or variety of things)
'piece containing extremes of emotional' is the wordplay.
'piece' becomes 'section' (both can mean a part of something).
'containing' is an insertion indicator.
'extremes of' says to hollow out the word (remove centre letters) (only the letters at the extremes of the word).
'emotional' with its middle removed is 'el'.
'section' enclosing 'el' is 'SELECTION'.
(Other definitions for selection that I've seen before include "Horse tipped for betting" , "Choice, pick" , "Act of choosing" .)