Prisoner employed jet outside in a muddled way (10)

'prisoner employed jet outside in a muddled way' is the definition.
I can't tell whether this defines the answer.

'prisoner employed jet outside in' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'employed' becomes 'used' ('use' can be a synonym of 'employ').
'jet outside' becomes 'fly' (I can't explain this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'used' put within 'fly' is 'fusedly'.
'con'+'fusedly'='CONFUSEDLY'

Can you help me to learn more?