Outspoken, a Parisian tucking into sandwich? (5)
I believe the answer is:
blunt
'outspoken' is the definition.
(synonyms)
'a parisian tucking into sandwich?' is the wordplay.
'a parisian' becomes 'un'.
'tucking into' means one lot of letters goes inside another.
'sandwich?' becomes 'blt' (BLT is an example).
'un' going within 'blt' is 'BLUNT'.
(Other definitions for blunt that I've seen before include "6 [JOHNSON]" , "Take the edge off" , "Plain-spoken - lacking point" , "Unsharpened" , "Dull - outspoken - spy" .)