Perhaps Flanders is hosting a climbing event (6)
I believe the answer is:
slalom
'event' is the definition.
(slalom is a kind of event)
'perhaps flanders is hosting a climbing' is the wordplay.
'perhaps' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'flanders' becomes 'moll' (I've seen this in another clue).
'is hosting' means one lot of letters goes inside another (inserted letters are welcomed in or hosted).
'climbing' is a reversal indicator (in a down clue, letters climb up).
'moll' placed around 'a' is 'molal'.
'molal' back-to-front is 'lalom'.
's'+'lalom'='SLALOM'
Can you help me to learn more?
(Other definitions for slalom that I've seen before include "Winter Olympic event" , "Windy skiing event" , "Type of ski race" , "Skiing obstacle race" , "Downhill race over a winding course on skis" .)