Maybe Roy gets cross with the beast (4)
I believe the answer is:
oryx
'the beast' is the definition.
(I've seen this before)
'maybe roy gets cross' is the wordplay.
'maybe' indicates an anagram.
'gets' is a charade indicator (letters next to each other).
'cross' becomes 'x' (X is cross-shaped).
'roy' with letters rearranged gives 'ory'.
'ory'+'x'='ORYX'
'with' is the link.
(Other definitions for oryx that I've seen before include "creature" , "Long-horned African antelope" , "horny beast" , "African long-horned grazer" , "Large African antelope with long straight horns" .)