Giving a lime squash to a girl (6)
I believe the answer is:
amelia
'girl' is the definition.
'giving a lime squash to a' is the wordplay.
'giving' is a charade indicator (letters next to each other).
'squash' is an anagram indicator (I've seen this in other clues).
'to' says to put letters next to each other.
'lime' with letters rearranged gives 'meli'.
'a' next to 'meli' is 'ameli'.
'ameli'+'a'='AMELIA'
(Other definitions for amelia that I've seen before include "-- Earhart, aviator" , "famous pilot" , "Legless condition" , "Fielding novel" , "Bloomer maybe" .)