Cryptic crossword clue
It was pledged to be red hot 5

The most common and most likely answer to this crossword clue is the 5 letter word TROTH

I've seen this crossword clue in Financial Times
T
R
O
T
H


Buddy explains!

The straight part
We know that "It was pledged" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it was pledged = troth.
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 TROTH mean?

TROTH noun
  1. An oath, pledge, or promise.
  2. Truth; something true.
TROTH verb
  1. To pledge to marry somebody.

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