Brain Game: Another Poem Wot I Writ Myself

Each line of this eight-line poem is a clue to a different word. The first line represents an eight-letter word. Drop one letter and rearrange the rest, and you'll come up with a seven-letter word that fits the second clue. Drop another letter and rearrange, and you'll find a six-letter word matching the third clue, and so on, down to a single-letter answer for the last clue. Good luck!

Sea creature, I suggest you. Against The holiest men, A Mexican coin; I use bread Like some Boxes. A circle.

Here is the SOLUTION.

THE SOLUTION:

PORPOISE (A sea creature)
PROPOSE (I suggest you)
OPPOSE (Against)
POPES (The holiest men)
PESO (A Mexican coin)
SOP (I use bread)
PO (Like some Boxes)
O (A circle)