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 am not certain of 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' placed 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" .)