A card in more senses than one (5)
I believe the answer is:
joker
'one' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for joker that I've seen before include "Funny man in pack" , "Playing card" , "Pack's extra card" , "Card - wag" , "trickster" .)