Bad weather outside, is inside having something to eat (6)
I believe the answer is:
raisin
'something to eat' is the definition.
(raisin is a kind of food)
'bad weather outside is' is the wordplay.
'bad weather' becomes 'rain' (rain is an example of bad weather).
'outside' is an insertion indicator (some letters go outside others).
'rain' enclosing 'is' is 'RAISIN'.
'inside having' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for raisin that I've seen before include "Dried 18" , "Dried grape used in cakes" , "Dried fruit" , "Cultivating" , "An iris (anag)" .)