Learner in French city meeting youth leader, kindly (6)
I believe the answer is:
nicely
'kindly' is the definition.
(thesaurus)
'learner in french city meeting youth leader' is the wordplay.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'in' means one lot of letters goes inside another.
'french city' becomes 'Nice' (Nice is a French city).
'meeting' says to put letters next to each other.
'youth leader' becomes 'y' (I've seen this in other clues).
'nice'+'y'='nicey'
'l' inserted into 'nicey' is 'NICELY'.
(Other definitions for nicely that I've seen before include "'Amiably, pleasantly (6)'" , "Agreeably, respectably" , "Good-naturedly" , "well - with 16d" , "In a pleasant way" .)