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 answer and definition can be both quantities as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'cards available for trams?' is the wordplay.
'trams' anagrams to 'SMART'.
But, I am unsure how the anagram is indicated.

'such' acts as a 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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