The most common and most likely answer to this crossword clue is the 7 letter word KINGDOM
I've seen this crossword clue in Independent
K
I
N
G
D
O
M
More clues leading to the result KINGDOM
- It's involved in stocking domestic animals, say
- Isambard Brunel's domain
- Top group of names doing runs in kilometres
- Family mass involves strange god in sovereign state
- United follower maybe – doing wrong in outskirts of Khartoum?
- Territory no good party covered in imperialistic work
- Lacking dominion in part. Not in this realm.
- Natural division of family leads to extremely good order
- Realm of “Billie Jean”? Perform Michael’s first
- Relations, good first and last, given honour in country
Buddy explains!

The straight part
We know that "Territory" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case territory = kingdom.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 KINGDOM mean?
KINGDOM noun- A realm having a king and/or queen as its actual or nominal sovereign.
- A realm, region, or conceptual space where something is dominant.
- A rank in the classification of organisms, below domain and above phylum; a taxon at that rank (e.g. the plant kingdom, the animal kingdom).