Bird's hiding in hibiscus (4)
I believe the answer is:
ibis
'bird's' is the definition.
(ibis is a kind of bird)
'hiding in hibiscus' is the wordplay.
'hiding' indicates a hidden word.
'IBIS' can be found hidden inside 'in hibiscus'.
(Other definitions for ibis that I've seen before include "Wading bird sacred to the Egyptians" , "Wading bird of tropical waters" , "Bird with long neck and legs and a curved bill" , "Wading bird of warm regions" , "I'm faced with big bill" .)