My unique holding of cash (5)
I believe the answer is:
money
'cash' is the definition.
(cash is a type of money)
'my unique holding' is the wordplay.
I cannot really see how this works, but
'unique' could be 'one' (synonyms) and 'one' is present in the answer.
'my' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for money that I've seen before include "It's the root of all evil" , "See 7" , "Medium of exchange" , "Coins, banknotes, etc" , "Euro for example" .)