Visual Description: Addition session.
LNGUF = FLUNG, HGURS = SHRUG, NIETTN = INTENT, DUTEMI = TEDIUM — Giving us: UGSHNTIM
Clue/Question: No matter what numbers are added together, the total will equal – – –
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Answer: “SUMTHING“
(LOL! I think if David L. Hoyt HAD put in – the expected – hyphen the final answer would’ve been a bit too obvious. Either way, it made for a good pun. It reminds me of the – now – politically incorrect joke of the Chinese kid named Sum Ting Wong! Wrong? Sure, but at least it is one of the cleaner ones.
All of today’s clue words are already on the ralis95 clue word database. However, all of the jumbles are coming up as new, for me. I really liked “hgurs” and “dutemi”. The answer letter layout was a great eight letter jumble. Very decently cryptic! The quotation marks were a big clue.
Kind of a stock elementary classroom cartoon. I believe that is Miss Crabapple, teaching the tots, at the whiteboard. Remember when it was the blackboard? And chalk? And having to clean the erasers outside, by clapping them together? I wonder which is unhealthier, breathing in the chalk dust, or the fumes from the magic markers? Be well and do good, friends.) — YUR
Images courtesy of Google
Unclerave's Wordy Weblog 
Got it, but I was all around the answer. Was trying to figure out an ING word. Finally culled out THING ???? Then … duh… “SUMTHING!”.
I think you would’ve gotten it quicker with a hyphen, LL. — YUR