The most common and most likely answer to this crossword clue is the 7 letter word DEARTHS
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More clues leading to the result DEARTHS
Buddy explains!

The straight part
We know that "shortages" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shortages = dearths.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.
What does DEARTHS mean?
DEARTHS noun- A period or condition when food is rare and hence expensive; famine.
- (by extension) Scarcity; a lack or short supply.
- Dearness; the quality of being rare or costly.