Live, eat and act properly (6)
I believe the answer is:
behave
'act properly' is the definition.
(I've seen this before)
'live eat' is the wordplay.
'live' becomes 'be' (synonyms).
'eat' becomes 'have' (I've seen this in another clue).
'be'+'have'='BEHAVE'
'and' is the link.
(Other definitions for behave that I've seen before include "Act in a certain manner" , "Act or react - show good manners" , "Act properly" , "Conduct oneself properly" , "Act in a certain way" .)