So-called lion/man hybrid (7)
I believe the answer is:
nominal
'so-called' is the definition.
(I've seen this in another clue)
'lionman hybrid' is the wordplay.
'hybrid' is an anagram indicator (a hybrid is a mixture).
'lionman' anagrammed gives 'NOMINAL'.
(Other definitions for nominal that I've seen before include "So called" , "Token - lion man (anag)" , "Peppercorn rent" , "Minor" , "In name only or of token value (7)" .)