The most common and most likely answer to this crossword clue is the 4 plus 11 letter word ROOM TEMPERATURE
I've seen this crossword clue in The Guardian
R
O
O
M
T
E
M
P
E
R
A
T
U
R
E
More clues leading to the result ROOM TEMPERATURE
- Degree of heat moderate in marsupial of adult age?
- Standard inside edges in Melbourne getting team out, error unfortunately inspiring paceman initially
- Ruse team promoter devised with sun out in normal conditions
- Marsupial, fully grown, retaining composure in comfortable warmth
- With not a single second wasted, post mortem reassures around 20, normally?
Buddy explains!
The straight part
We know that "Standard inside" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case standard inside = room temperature.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 ROOM TEMPERATURE mean?
ROOM TEMPERATURE adjective- At a typical temperature of indoor surroundings (about 20 to 23ºC); neither heated nor chilled.