Crossword Genius

It’s really difficult to know; showing no value recently (3,5,3,4)

Ross

I believe the answer is:

you never can tell

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'it's really difficult to know showing no value recently' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'it's really difficult to know showing no value recently' is the wordplay.
'no value recently' can be anagrammed to 'YOU NEVER CAN TELL'.
Though, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for you never can tell that I've seen before include ""Don't go shopping"" , "song written by Chuck Berry" , "Exclamation on the unpredictability of life" , "It's impossible to say" , "It's always impossible to predict" .)

I've seen this clue in the Sydney Morning Herald.
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