She gives little Beatrice about £50 (5)
I believe the answer is:
bella
'she' is the definition.
'little beatrice about ps50' is the wordplay.
'little' means to remove the last letter (the word is not quite complete).
'beatrice' becomes 'Bea' (Bea is short for Beatrice).
'about' says the letters should be written in reverse.
'ps50' becomes 'all' (I can't explain this - if you can you should give a lot more credence to this answer).
'all' backwards is 'lla'.
'bea' with its last letter removed is 'be'.
'be'+'lla'='BELLA'
'gives' is the link.
Can you help me to learn more?
(Other definitions for bella that I've seen before include "Girl's name" , "Deadly nightshade or atropine" , "Girl" .)