Wader found in another one (5)
I believe the answer is:
heron
'wader' is the definition.
(I know that heron is a type of wader)
'in another one' is the wordplay.
'in' says the answer is hidden in the clue.
'HERON' is hidden within 'another one'.
'found' is the link.
(Other definitions for heron that I've seen before include "Wading bird with long neck and legs" , "Big bird" , "Bird of the Rhone, strangely" , "One bird" , "flier" .)