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"backer" is also used as a crossword clue. If that's what you saw, the answer is often sponsor (7 letters).
Definitions
someone who provides financial support for some venture
Word origin
From back + -er.
Used in a sentence
“/eɪ/ This diphthong is a glide from mid front tongue position toward a higher, backer position similar to that of /ɪ/.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Financial supporter”6 letters
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