Answer: useof

AnswerCrossword Clue
USEOF

".. this product may be..."

USEOF

"What's the .. Wond'rin'": "Carousel" song

USEOF

Make ..: employ

USEOF
Make ... (apply)
USEOF
Make good ....
USEOFMake ... (employ)
USEOFMake -- (employ)
USEOFMake -- (do something with)
USEOF"What's the ... Wond'rin'?" ("Carousel" song)