For protective cover, she has £50 (5)
I believe the answer is:
shell
'for protective cover' is the definition.
I can't judge whether this definition defines the answer.
'she has ps50' is the wordplay.
'has' is a charade indicator (letters next to each other).
'ps50' becomes 'll' (I can't explain this - if you can you should give a lot more credence to this answer).
'she'+'ll'='SHELL'
Can you help me to learn more?
(Other definitions for shell that I've seen before include "Mollusc's casing" , "Carapace or cartridge" , "pepper?" , "Carapace; bombard" , "layer of jacket" .)