Cricket club try losing runs? That's crazy (5)
I believe the answer is:
batty
'crazy' is the definition.
(thesaurus)
'cricket club try losing runs?' is the wordplay.
'cricket club' becomes 'bat' (I've seen this before).
'losing' is a deletion indicator.
'runs?' becomes 'r' (cricket abbreviation).
'try' with 'r' taken out is 'ty'.
'bat'+'ty'='BATTY'
'that's' is the link.
(Other definitions for batty that I've seen before include "out to lunch" , "Seemingly descriptive of vampire" , "Nuts" , "As mad as a mouselike mammal" , "not sound" .)