Chaps beginning to understand list of options (4)
I believe the answer is:
menu
'list of options' is the definition.
(I've seen this before)
'chaps beginning to understand' is the wordplay.
'chaps' becomes 'men' (chap means a man).
'beginning to' says to take the initial letters.
The initial letter of 'understand' is 'u'.
'men'+'u'='MENU'
(Other definitions for menu that I've seen before include "Tariff" , "List of food items on offer" , "List of items to choose from as in restaurant" , "Restaurant fare" , "List of (computer or food) items" .)