Not as entertaining bachelor with Love Island (6)
I believe the answer is:
lesbos
'island' is the definition.
(Greek island)
'not as entertaining bachelor with love' is the wordplay.
'not as' becomes 'less' (eg 'not as tall' means 'less tall').
'entertaining' indicates putting letters inside.
'bachelor' becomes 'B' (abbreviation e.g. BA=Bachelor of Arts).
'with' means one lot of letters go next to another.
'love' becomes 'o' (love means zero in tennis).
'b'+'o'='bo'
'less' going around 'bo' is 'LESBOS'.
(Other definitions for lesbos that I've seen before include "Jot" , "Greek island, birthplace of Sappho" , "Greek island -- home of 3" , "Island, home of Sappho" .)