Going back to get the rent, are somehow trapped within it (2,7)

'going back to' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'the rent are somehow trapped within it' is the wordplay.
'are somehow' is an anagram indicator.
'trapped' becomes 'rea' (I can't explain this - if you can you should believe this answer much more).
'within' means one lot of letters goes inside another.
'rent' anagrammed gives 'nret'.
'nret'+'rea'='nretrea'
'nretrea' put within 'it' is 'IN RETREAT'.

'get' acts as a link.

Can you help me to learn more?