Team prepared to show heart (4)
I believe the answer is:
meat
'heart' is the definition.
(I know that heart can be written as meat)
'team prepared' is the wordplay.
'prepared' is an anagram indicator.
'team' anagrammed gives 'MEAT'.
'to show' is the link.
(Other definitions for meat that I've seen before include "grub, say" , "Edible flesh" , "Chops, steaks etc" , "Animal flesh as food" , "17 [ESSENCE]" .)