Crossword Puzzle Kind of back, in football

Clue: Kind of back, in football

Officiate a football game, informally (REF with 3 letters)
Kind of interest (e.g. ACCRUED with 7 letters)
Kind of back (e.g. ACHING with 6 letters)
Kind of indigestion (e.g. ACID with 4 letters)
Kind of phobia involving heights (ACRO with 4 letters)
Kind of ingredient (ACTIVE with 6 letters)
Kind of office machine (ADDING with 6 letters)
Kind of instinct (e.g. ANIMAL with 6 letters)
Required investment of a kind (ANTE with 4 letters)
College Football Hall of Fame inductee 29 years after Knute (ARA with 3 letters)