Clue: Beast reminding one of Hitler, equipment stuff being one short! (6)
Answer: RIGLIN
Explanation: Definition: Beast reminding one of Hitler
**RIG** ("equipment") + **LIN**(e) ("stuff" *being one* (letter) *short*) 
*A *riglin* is an animal with only one testicle. In urban mythology, Hitler is reputed to have had only one testicle. A song often sung in my childhood implied that the other was in the Albert Hall, and that it had been removed by his own mother.