"If You Knew ___" (5)

I believe the answer is:

susie

(Other definitions for susie that I've seen before include "Girl's name" , "Girl" , "Little Susannah" , "Tongue-twister sister sewing shirts for soldiers" , "Wake Up Little - (Everly Brothers)" .)

I've seen this clue in the Penny Press and the Thinks.com.

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