Dried food is submerged in water (6)
I believe the answer is:
raisin
'dried food' is the definition.
'raisin' can be an answer for 'food' (raisin is a kind of food). I'm not sure about the 'dried' bit.
'is submerged in water' is the wordplay.
'submerged in' is an insertion indicator (I've seen this in other clues).
'water' becomes 'rain' (rain is a kind of water).
'is' going inside 'rain' is 'RAISIN'.
Can you help me to learn more?
(Other definitions for raisin that I've seen before include "fruit product" , "Dried fruit" , "Fruit for the Christmas cake" , "Large dried grape" , "sultana, say" .)