Try on top and bottom of this suit (6)
I believe the answer is:
hearts
'suit' is the definition.
(hearts is a playing card suit)
'try on top and bottom of this' is the wordplay.
'try' becomes 'hear' (as in to try someone in court or hear their case).
'on' means one lot of letters go next to another.
'top and bottom of' says to hollow out the word (remove centre letters) (only the top and bottom letters).
'this' with its middle taken out is 'ts'.
'hear'+'ts'='HEARTS'
(Other definitions for hearts that I've seen before include "Central parts" , "Vital organs in the pack" , "Card suit and essential organs" , "Suit in pack" , "Playing card suit" .)