Maybe it's over £50 even today (5)
I believe the answer is:
still
'even today' is the definition.
'still' can be an answer for 'even' (I've seen this in another clue). I'm unsure of the 'today' bit.
'maybe it's over ps50' is the wordplay.
'maybe' indicates an anagram.
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'ps50' becomes 'ill' (I can't explain this - if you can you should give a lot more credence to this answer).
'ts' anagrammed gives 'st'.
'st'+'ill'='STILL'
Can you help me to learn more?
(Other definitions for still that I've seen before include "Snap" , "Yet - hushed" , "Where to make spirits" , "source of spirits" , "Static photograph" .)