Scoundrel in hotel, having fish (4)
I believe the answer is:
heel
'scoundrel' is the definition.
(heel can mean a scoundrel or villain)
'hotel having fish' is the wordplay.
'hotel' becomes 'h' (phonetic alphabet).
'having' says to put letters next to each other.
'fish' becomes 'eel' (eel is a type of fish).
'h'+'eel'='HEEL'
'in' acts as a link.
(Other definitions for heel that I've seen before include "order to dog" , "Despicable type" , "villain" , "Hindu loincloth" , "Back of 15 across" .)