ER, OO Net addition?
Theme: replacing the letter combination “er” with “oo” yielding a new phraseConvict’s level on a prison ship?
PERPDECK [poop deck]Evict a “Wizard of Oz” actor?
BOOTLAHR [Bert Lahr]Deceptive swap that literally resulted in [theme]
THEOLDSWITCHEROO [note “er” and “oo”] Grenoble gal pal
AMIE [there was a big hit song with this title --- in English]
Three grins = Excellent: Loved it; Two grins = Good: Enjoyed it; One grin = Satisfactory: A bit bland for my taste; One teardrop = Unsatisfying: No fun