Crossword puzzle clue "note to be used later"

Here are the possible solutions for note to be used later clue

Answer
Clue
Relevancy
iou
Clue
Note to be used later
Payment-to-come-later note
"I will pay you later" note
"Bill me later" note
touchpad
Clue
HP tablet released in July 2011, then discontinued six weeks later (then revived later in the year!)
ela
Clue
Note of note in crosswords
High note of note
highc
Clue
Soprano's note of note

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