Lee is unusual name for girl (5)
I believe the answer is:
elsie
'name for girl' is the definition.
(I've seen this before)
'lee is unusual' is the wordplay.
'unusual' indicates an anagram.
'lee'+'is'='leeis'
'leeis' anagrammed gives 'ELSIE'.
(Other definitions for elsie that I've seen before include "Name for girl" , "Girl's name" , "Female name; rhymes with London football team" , "woman" , "Lady" .)