twyngwyn has it.
Hear the frightener, I hear the soup spoon is a strengthener (7)
WORDPLAY
Hear the frightener [charade] = boo
I hear* [indicator:homophone] the soup spoon (what the soup spoon DOES) = stir
boo + (sounds like) stir = booster
DEFINITION
is a strengthener = booster
* I was using the "I hear" in a double sense: if you hear the soup spoon, it's either ladelling or stirring. It also functioned as the homophone indicator.
The pen of clues, freshly dipped into cryptic ink, is in your hands, twyngwyn.
