The beastly one in Hamlet? (5,4)
I believe the answer is:
great dane
'the beastly one in hamlet?' is the definition.
'great dane' can be an answer for 'hamlet?' (I've seen this before). I'm not sure about the 'the beastly one in' bit.
'in hamlet?' is the wordplay.
'in' becomes 'great' (I can't justify this - if you can you should believe this answer much more).
'hamlet?' becomes 'dane' (Hamlet is a famous Dane).
'great'+'dane'='GREAT DANE'
Can you help me to learn more?
(Other definitions for great dane that I've seen before include "Could be barking" , "Big dog" , "Powerful dog" , "Dog -- a tad green (anag)" , "Andersen" .)