Another one includes a wader (5)
I believe the answer is:
heron
'a wader' is the definition.
(heron is a kind of wader)
'another one includes' is the wordplay.
'includes' says the answer is hidden in the clue.
'HERON' is hidden in the letters of 'another one'.
(Other definitions for heron that I've seen before include "flier" , "Rhone (anag) - bird" , "Wading bird with long neck and legs" , "Long-legged long-necked wading bird" , "Graceful grey bird with long neck" .)