Crossword Genius

Wherein Eulenspiegel kept his cash? (4)

Ross

I believe the answer is:

till

I'm a little stuck... Click here to teach me more about this clue!

'wherein eulenspiegel kept his cash?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'his cash?' is the wordplay.
'his' becomes 'til' (I am not sure about this - if you are sure you should believe this answer much more).
'cash?' becomes 'l' (The pound sterling symbol is an elaborate L).
'til'+'l'='TILL'

Can you help me to learn more?

(Other definitions for till that I've seen before include "Container for money" , "Cashbox" , "Cultivate - cash drawer" , "Dig soil" , "Drawer holding money in shop." .)

I've seen this clue in the Evening Standard.
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