Spanish poet's killer chasing Liberal (5)
I believe the answer is:
lorca
'spanish poet's' is the definition.
(poet Federico Garcia Lorca)
'killer chasing liberal' is the wordplay.
'killer' becomes 'orca' (orca is a term for the killer whale).
'chasing' is a charade indicator (letters next to each other) (some letters chase after others).
'liberal' becomes 'l' (abbreviation).
'orca' put after 'l' is 'LORCA'.
(Other definitions for lorca that I've seen before include "poet from Spain" , "Federico Garcia -----, poet assassinated in the Spanish Civil War" , "in Murcia" , "Federico Garcia -, twentieth century Spanish poet/playwright" , "Federico Garc'a-, Sp. poet; carol (anag.)" .)