£50 in pocket? Have fine attire (8)
I believe the answer is:
ballgown
'fine attire' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'ps50 in pocket? have' is the wordplay.
'ps50' becomes 'll' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'pocket?' becomes 'bag' (pocket is a kind of bag).
'have' becomes 'own' (to have something is to own it).
'll' placed into 'bag' is 'ballg'.
'ballg'+'own'='BALLGOWN'
Can you help me to learn more?
(Other definitions for ballgown that I've seen before include "Damaged (like a muscle)" , "Formal frock" .)