Bird nesting in hibiscus (4)
I believe the answer is:
ibis
'bird' is the definition.
(ibis is a kind of bird)
'nesting in hibiscus' is the wordplay.
'nesting in' indicates a hidden word.
'IBIS' is hidden in the letters of 'hibiscus'.
(Other definitions for ibis that I've seen before include "Bird sacred in Ancient Egypt" , "Wader with a long down-curved bill" , "Type of bird" , "Wading bird of tropical waters" , "Retreat" .)