Crossword Genius

Are such cards available for trams? (5)

Ross

I believe the answer is:

smart

I'm a little stuck... Click here to teach me more about this clue!

'are' is the definition.
The definition and answer can be both quantities as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'cards available for trams?' is the wordplay.
'trams' can be anagrammed to 'SMART'.
Though, I am unsure how this is indicated.

'such' is the link.

Can you help me to learn more?

(Other definitions for smart that I've seen before include "Quick; tidy; sting" , "Sort of card" , "Rankle; trim" , "astute" , "Bright or dapper" .)

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