Dog that staggers? (7)
I believe the answer is:
lurcher
'dog' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for lurcher that I've seen before include "The dog to stagger" , "moving suddenly and unsteadily?" , "one making staggering movements" , "Crossbred hunter" , "Greyhound-like dog" .)