The most common and most likely answer to this crossword clue is the 9 letter word NO-FRILLS
N
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F
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More clues leading to the result NO-FRILLS
Buddy explains!

The straight part
We know that "Economy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case economy = no-frills.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 NO-FRILLS mean?
NO-FRILLS adjective- Basic or simple; providing only what is necessary, without anything extra or fancy.
- Alternative form of no frills