A girl gets at some cash in the till (5)

I believe the answer is:

float

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'some cash in the till' is the definition.
I can't tell whether this definition defines the answer.

'a girl gets at' is the wordplay.
'a girl' becomes 'flo' (short for Florence).
'gets' is a charade indicator (letters next to each other).
'flo'+'at'='FLOAT'

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(Other definitions for float that I've seen before include "Carnival display" , "cash in hand" , "Stay on the surface without sinking" , "Vehicle for delivering milk" , "Rest on liquid" .)

I've seen this clue in the Evening Standard.

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