Muck around in Emil’s place (5)
I believe the answer is:
slime
'muck around' is the definition.
'slime' can be an answer for 'muck' (thesaurus). I'm not sure about the 'around' bit.
'emil's place' is the wordplay.
'place' indicates an anagram (I've seen 'placed' mean this (placing the letters)).
'emils' is an anagram of 'SLIME'.
'in' is the link.
Can you help me to learn more?
(Other definitions for slime that I've seen before include "Moist slippery stuff" , "Gunge" , "Nasty slippery stuff" , "could make things sticky" , "Unpleasantly moist and slippery substance" .)