Second part of play contains regular mascots as well by the sounds of it (3,3)

'second part of play' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'regular mascots as well by the sounds of it' is the wordplay.
'regular' means one should take alternating letters.
'as well' becomes 'too' (both can mean 'also').
'by the sounds of it' shows a homophone (sound like).
The alternate letters of 'mascots' are 'act'.
'too' is a homophone of 'two'.
'act'+'two'='ACT TWO'

'contains' is the link.

Can you help me to learn more?