Dead in Pyrenean city where land is flat (7)
I believe the answer is:
plateau
'is flat' is the definition.
(thesaurus)
'dead in pyrenean city' is the wordplay.
'dead' becomes 'late' (similar in meaning).
'in' indicates putting letters inside.
'pyrenean city' becomes 'pau' (I can't explain this - if you can you should give a lot more credence to this answer).
'late' inserted inside 'pau' is 'PLATEAU'.
'where land' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for plateau that I've seen before include "Raised level area" , "Flat-topped upland" , "Paul, eat! (anag)" , "Flat raised land" , "Flat highland" .)