Crumbs Joe gives dog (5)
I believe the answer is:
corgi
'dog' is the definition.
(I know that corgi is a type of dog)
'crumbs joe' is the wordplay.
'crumbs' becomes 'cor' (both can be exclamations of shock).
'joe' becomes 'GI' (GI Joe).
'cor'+'gi'='CORGI'
'gives' is the link.
(Other definitions for corgi that I've seen before include "Welsh breen of dog" , "The Queen's favourite?" , "Cardigan or Pembroke dog" , "Royal pet" , "man's best friend" .)