Crumbs US soldier gives dog (5)
I believe the answer is:
corgi
'dog' is the definition.
(corgi is a kind of dog)
'crumbs us soldier' is the wordplay.
'crumbs' becomes 'cor' (both can be exclamations of shock).
'us soldier' becomes 'gi' (I've seen this in other clues).
'cor'+'gi'='CORGI'
'gives' acts as a link.
(Other definitions for corgi that I've seen before include "Dog popular with British royals" , "Dog at Buckingham Palace" , "pet in 9 [CARDIFF]?" , "man's best friend" , "Dog of Welsh breed, royal favourite" .)