Beast found in dry enclosure, initially (5)
I believe the answer is:
brute
'beast' is the definition.
('brute' can be a synonym of 'beast')
'dry enclosure initially' is the wordplay.
'dry' becomes 'brut' (type of wine).
'initially' says to take the initial letters.
The first letter of 'enclosure' is 'e'.
'brut'+'e'='BRUTE'
'found in' is the link.
(Other definitions for brute that I've seen before include "Nasty person, a real beast" , "Beast - "Et tu ____ !"" , "Cruelly rapacious person" , "Savage person" , "Cruel person" .)