Big shot doesn't get gist of what's on the range (3)
I believe the answer is:
hob
'big shot doesn't get gist' is the definition.
I can't tell whether this defines the answer.
'of what's on the range' is the wordplay.
'of' becomes 'o'.
'what's on' means one lot of letters goes inside another.
'the range' becomes 'hb' (I can't explain this - if you can you should believe this answer much more).
'o' put inside 'hb' is 'HOB'.
Can you help me to learn more?
(Other definitions for hob that I've seen before include "Top of stove" , "Hot-plate" , "Cooking range" , "Male ferret" , "Cooking appliance" .)