Scoundrel's almost lascivious following bird (6)
I believe the answer is:
curlew
'bird' is the definition.
(curlew is a kind of bird)
'scoundrel's almost lascivious following' is the wordplay.
'scoundrel' becomes 'cur' (I've seen this before).
'almost' means to remove the last letter (most of the word but not all of it).
'lascivious' becomes 'lewd' ('lewd' can be a synonym of 'lascivious').
'following' says to put letters next to each other.
'lewd' with its final letter removed is 'lew'.
'cur'+'lew'='CURLEW'
(Other definitions for curlew that I've seen before include "Shorebird with long down-curved bills" , "Wading bird with fluting call" , "Bird with long down-curved bill" , "Shorebird with long curved bill" , "Wading bird with long slender curved bill" .)