Men raised Deutschmarks in tax: something for a rainy day? (5,5)
I believe the answer is:
storm drain
'something for a rainy day?' is the definition.
I know nothing about this answer so I can't judge whether this works.
'men raised deutschmarks in tax' is the wordplay.
'men' becomes 'OR' (military abbreviation for other ranks).
'raised deutschmarks' becomes 'md' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'tax' becomes 'strain' (both can mean to demand a lot from).
'or'+'md'='ormd'
'ormd' inserted into 'strain' is 'STORM DRAIN'.
Can you help me to learn more?
(Another definition for storm drain that I've seen is " emergency outlet?".)