Firm changed menus: what will diners do? (7)
I believe the answer is:
'what will diners do?' is the definition.
I can't judge whether this definition defines the answer.
'firm changed menus' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'changed' is an anagram indicator.
'menus' is an anagram of 'nsume'.
Can you help me to learn more?
(Other definitions for consume that I've seen before include "Devour" , "Use up" , "Eat, drink" , "Exhaust" .)