The most common and most likely answer to this crossword clue is the 5 letter word WIVES
I've seen this crossword clue in The Times
W
I
V
E
S
More clues leading to the result WIVES
Buddy explains!

The straight part
We know that "them indoors?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case them indoors? = wives.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.
What does WIVES mean?
WIVES noun- A married woman, especially in relation to her spouse.
- The female of a pair of mated animals.
- An adult female human.
- (collective) All females collectively; womankind.
- A female person, usually an adult; a (generally adult) female sentient being, whether human, supernatural, elf, alien, etc.
- A wife (or sometimes a fiancée or girlfriend).
- A female who is extremely fond of or devoted to a specified type of thing. (Used as the last element of a compound.)
- A female attendant or servant.