Extremely mean falsehoods stopping Mr T moving south (10)

'extremely mean falsehoods stopping mr t moving south' is the definition.
I can't tell whether this definition defines the answer.

'mr t moving south' is the wordplay.
I cannot quite understand how this works, but
'mr' could be 'erl' and 'erl' is found in the answer.
't' is present in the answer.
'south' could be 's' (abbreviation) and 's' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?