Sweet concretion here in Paris no good (5)
I believe the answer is:
icing
'sweet' is the definition.
(thesaurus)
'here in paris no good' is the wordplay.
'here in paris' becomes 'ici' ('here' in French).
'no good' becomes 'ng' (abbreviation).
'ici'+'ng'='ICING'
'concretion' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for icing that I've seen before include "Sweet thing" , "Sugary topping" , "Possibly the nicest part of the cake" , "Deposit" , "East European nation" .)