Type in good club that will supply ID (8,4)
I believe the answer is:
branding iron
'that will supply id' is the definition.
(tool used to brand or identify livestock)
'type in good club' is the wordplay.
'type' becomes 'brand' (I've seen this in another clue).
'good' becomes 'g' (abbreviation).
'club' becomes 'iron' (type of golf club).
'brand'+'in'+'g'+'iron'='BRANDING-IRON'
(Other definitions for branding iron that I've seen before include "Implement for marking livestock" , "identifies the beast"" .)