Without risk, bank on shilling, old money (8)
I believe the answer is:
securely
'without risk bank on shilling old money' is the definition.
I can't tell whether this definition defines the answer.
'without risk bank on shilling' is the wordplay.
'without risk' becomes 'ecu' (I can't justify this - if you can you should give a lot more credence to this answer).
'bank' becomes 'rely' (to bank on something is to rely on it).
'on' is a charade indicator (letters next to each other).
'shilling' becomes 's' (abbreviation e.g. Lsd - pounds, shillings, pence).
'ecu'+'rely'='ecurely'
'ecurely' put after 's' is 'SECURELY'.
Can you help me to learn more?
(Other definitions for securely that I've seen before include "Firmly (fixed)" , "In a safe manner" , "In a stable way" , "out of danger" .)