It's difficult to settle for the Parisian in outskirts of Birmingham (7)
I believe the answer is:
problem
'it's difficult' is the definition.
(thesaurus)
'for the parisian in outskirts of birmingham' is the wordplay.
'for' becomes 'pro' (as in being 'pro' something).
'the parisian' becomes 'le' (definite article in French).
'in' means one lot of letters goes inside another.
'outskirts of' says to hollow out the word (remove centre letters) (only letters on the outskirts).
'birmingham' becomes 'Brum' (I've seen this before).
'brum' with its centre removed is 'bm'.
'le' going into 'bm' is 'blem'.
'pro'+'blem'='PROBLEM'
'to settle' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for problem that I've seen before include "Difficulty to be solved" , "Difficulty, poser" , "A matter hard to solve" , "Quandary or dilemma" , "Difficulty (these days, of any kind)" .)