Cryptic crossword clue
He goes inside to backed-up loo where one may get the runs 3,4

The most common and most likely answer to this crossword clue is the 3 plus 4 letter word THE OVAL

I've seen this crossword clue in Independent
T
H
E
O
V
A
L

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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

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