Cryptic crossword clue
Start off with a grainto make a device for warming up fat left out

The most common and most likely answer to this crossword clue is the 4 plus 4 letter word HEAT PUMP

H
E
A
T
P
U
M
P

Buddy explains!

The straight part
We know that "device for warming up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case device for warming up = heat pump.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

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