Evil master has drink with leaders of Farc in Columbia (7)
I believe the answer is:
malefic
'evil' is the definition.
(synonyms)
'master has drink with leaders of farc in columbia' is the wordplay.
'master' becomes 'm'.
'has' is a charade indicator (letters next to each other).
'drink' becomes 'ale' (type of beer).
'with' means one lot of letters go next to another.
'leaders of' suggests taking the first letters.
The initial letters of 'farc in columbia' is 'fic'.
'm'+'ale'+'fic'='MALEFIC'
(Other definitions for malefic that I've seen before include "Baleful" , "Causing harm" , "Having an evil influence" .)