Lertsong Lertsong?

Question:I used to dress my lert in pink,
But then I dipped his shirt
Into a vat of crimson ink;
Now I've a redder lert.

Best Answer - Chosen by Asker: I used to dress my lert in pink,
But then I dipped his shirt
Into a vat of crimson ink;
Now I've a redder lert.

I'm no literary genius but I think it's a whimsical play on words, it's fun and I enjoyed it.

It would be easier if you explained it.... But I think I get it.
(KInda pointing the obvious)

A redder lert--a red alert? I think I got it. I like it.