Additional gift good for Parisian and American (5)
I believe the answer is:
bonus
'additional gift' is the definition.
'bonus' can be an answer for 'gift' (thesaurus). I'm not certain of the 'additional' bit.
'good for parisian and american' is the wordplay.
'good for parisian' becomes 'bon' (French for 'good').
'and' means one lot of letters go next to another.
'american' becomes 'us'.
'bon'+'us'='BONUS'
Can you help me to learn more?
(Other definitions for bonus that I've seen before include "bribe" , "Additional incentive payment" , "Honorarium" , "Premium" , "Extra money paid for good performance" .)