Top bone from piece of meat (5)
I believe the answer is:
trump
'top' is the definition.
(thesaurus)
'bone from piece of meat' is the wordplay.
'bone' becomes 't' (I've seen this in other clues).
'from' says to put letters next to each other.
'piece of meat' becomes 'rump' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
't'+'rump'='TRUMP'
Can you help me to learn more?
(Other definitions for trump that I've seen before include "reliable person" , "Brick" , "Reliable type" , "Playing card having temporary higher value" , "Card beating other suits" .)