Absolute swine, but the best you can get around central Streatham (5)
I believe the answer is:
beast
'absolute swine' is the definition.
'beast' can be an answer for 'swine' (I've seen this in another clue). I am not certain of the 'absolute' bit.
'the best you can get around central streatham' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'best' could be 'a' and 'a' is located in the answer.
'get' could be 'be' ('get' can mean 'come to be') and 'be' is found within the answer.
A single letter 's' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'but' acts as a link.
Can you help me to learn more?
(Other definitions for beast that I've seen before include "Nasty type" , "Bully" , "Wild animal" , "Dangerous animal" , "Animal; cruel person" .)