Wader featured in another one (5)
I believe the answer is:
heron
'wader' is the definition.
(I know that heron is a type of wader)
'featured in another one' is the wordplay.
'featured in' indicates a hidden word.
'HERON' can be found hidden inside 'another one'.
(Other definitions for heron that I've seen before include "Large fish-eating bird" , "Wader" , "Tall wading bird" , "One bird" , "Large British wading bird" .)