At home, teams show guts (7)
I believe the answer is:
insides
'guts' is the definition.
(thesaurus)
'at home teams' is the wordplay.
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'teams' becomes 'sides' (I've seen this before).
'in'+'sides'='INSIDES'
'show' is the link.
(Other definitions for insides that I've seen before include "Entrails" , "guts" , "stomach" .)