Like this:-
Tromboniator is our host
So I’ll make an attempt at a post
And see if I can show
A wordy ‘Portmanteau’
Which ain’t just a feeble falboast*


*Falboast: n. an unsustainable claim to prowess (Eng. portmanteau wd, fr ‘false,’ ‘boast’)

I'm immortal until proven otherwise