Cryptic crossword clue
Economical? Yep, new Nissan’s 50% smaller – that’s revolutionary 5-4

The most common and most likely answer to this crossword clue is the 5 plus 4 letter word PENNY WISE

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "Economical" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case economical = penny wise.
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.

Crossword Answer definitions

PENNY WISE adjective
  1. Thrifty in regards to small amounts of money.

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