Shaped like a pepper pot, it contains beer (5)
I believe the answer is:
dalek
'shaped like a pepper pot' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'it contains beer' is the wordplay.
'it' becomes 'dk' (I can't explain this - if you can you should give a lot more credence to this answer).
'contains' is an insertion indicator.
'beer' becomes 'ale' (type of beer).
'dk' placed around 'ale' is 'DALEK'.
Can you help me to learn more?
(Other definitions for dalek that I've seen before include "Talking robot" , "Sci-fi robot" , "Foe of Dr Who" , "Doctor Who adversary" , "Hostile alien" .)