Californian's currency is hidden in hospital toilet (3,10)

'californian's' is the definition.
(someone from San Francisco)

'currency is hidden in hospital toilet' is the wordplay.
I cannot quite see how this works, but
'currency' could be 'franc' (old French currency) and 'franc' is found within the answer.
'is' is found in the answer.
'hospital' could be 'san' (I've seen this before) and 'san' is found within the answer.
'toilet' could be 'can' (synonyms) and 'can' is found in the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).