The most common and most likely answer to this crossword clue is the 8 letter word STAGNANT
I've seen this crossword clue in Financial Times
S
T
A
G
N
A
N
T
More clues leading to the result STAGNANT
- Grannie follows deer — trying, at first, to be still
- Still, grandma is admitted to men only entertainment inthe end
- Deer relative heading for tundra, still
- Still without female company, granny's taken to tango
- Monitor female relative in way still
- Deer relative heading for tundra still
- Only for men: old woman has time still
- Male relative back in rut, still
- Foul male beast beginning to turn on female relative
- Good bread in fact stale
Buddy explains!

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 STAGNANT mean?
STAGNANT adjective- Lacking freshness, motion, or flow; decaying through stillness.
- Without progress or change; stale; inactive.