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"endorsement" is also used as a crossword clue. If that's what you saw, the answer is often testimonial (11 letters).
Definitions
the act of endorsing
Word origin
From endorse + -ment.
Used in a sentence
“The association announced its endorsement of the policy.”
“The bank required that cheque endorsement be witnessed by a cashier.”
“Companies sometimes pay millions for product endorsement by celebrities.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Public backing”11 letters
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