It's meant to be played by one showing forbearance
I believe the answer is:
patience
'forbearance' is the definition.
(I know that forbearance can be written as patience)
'it's meant to be played by one' is the wordplay.
I cannot quite understand how this works, but
'by' could be 'at' and 'at' is found within the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is located in the answer.
This may be the basis of clue (or it may be nonsense).
'showing' is the link.
Can you help me to learn more?
(Other definitions for patience that I've seen before include "Waiting calmly" , "Musical work" , "Card game played by one person" , "Gilbertian dairymaid" , "Unhurried quality or solo card game" .)