Unfriendly lie about one who entertains first (7)
I believe the answer is:
hostile
'unfriendly' is the definition.
(I know that unfriendly can be written as hostile)
'lie about one who entertains first' is the wordplay.
'about' is an anagram indicator.
'one who entertains' becomes 'host' (I've seen this before).
'first' means one lot of letters go next to another.
'lie' anagrammed gives 'ile'.
'ile' put after 'host' is 'HOSTILE'.
(Other definitions for hostile that I've seen before include "Unkind" , "harsh" , "Inimical" , "Showing angry opposition" , "Bellicose" .)