One quit poem about a bloke, thanks to upbeat mindset (6,6)

'upbeat mindset' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'one quit poem about a bloke thanks' is the wordplay.
I cannot really see how this works, but
'one' could be 'un' (northern English dialect form of 'one') and 'un' is found in the answer.
'about' could be 'a' (abbreviation in Chambers) and 'a' is found in the answer.
'a' is present in the answer.
'thanks' could be 'ta' (UK informal version of 'thank you') and 'ta' is present in the answer.
This explanation may well be incorrect...

'to' acts as a link.

Can you help me to learn more?