Group on mountain serving up a number of dishes (6)
I believe the answer is:
plates
'a number of dishes' is the definition.
'plates' can be an answer for 'dishes' (plate is a kind of dish). I'm unsure of the 'a number of' bit.
'group on mountain serving up' is the wordplay.
'group' becomes 'set' (both can mean a collection).
'on' is a charade indicator (letters next to each other).
'mountain' becomes 'alp' (the Alps are a mountain range).
'serving up' says the letters should be written backwards.
'set'+'alp'='setalp'
'setalp' reversed gives 'PLATES'.
Can you help me to learn more?
(Other definitions for plates that I've seen before include "Flat dishes" , "Staple for food containers" , "dentures" , "Eating utensils of staple kind" , "Strange staple for crockery items" .)