Boy, passionate, upset girl (6)
I believe the answer is:
damsel
'girl' is the definition.
(I know that damsel is a type of maid)
'boy passionate upset' is the wordplay.
'boy' becomes 'les' (short for Leslie).
'passionate' becomes 'mad'.
'upset' shows that the letters should be reversed in order.
'les'+'mad'='lesmad'
'lesmad' reversed gives 'DAMSEL'.
(Other definitions for damsel that I've seen before include "Maid" , "distressed girl?" , "Girl (literary)" , "Old-fashioned young woman" , "An old girl, often in distress" .)