Word from Paris about a seedy swimsuit (7)
I believe the answer is:
maillot
'swimsuit' is the definition.
(maillot is a kind of swimsuit)
'word from paris about a seedy' is the wordplay.
'word from paris' becomes 'mot' ('word' in French).
'about' is an insertion indicator.
'seedy' becomes 'ill' (seedy can mean unwell).
'a'+'ill'='aill'
'mot' placed around 'aill' is 'MAILLOT'.
(Other definitions for maillot that I've seen before include "Top" , "Jersey" , "Tights worn for ballet" , "Swimsuit" .)