Shorebird is nameless stray (5)
I believe the answer is:
wader
'shorebird' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for wader that I've seen before include "Heron, say" , "Eg, sandpiper, flamingo" , "crane, perhaps" , "Long waterproof boot" , "Long-legged shore bird" .)