The most common and most likely answer to this crossword clue is the 10 letter word SEASONABLE
I've seen this crossword clue in The Daily Telegraph
S
E
A
S
O
N
A
B
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More clues leading to the result SEASONABLE
Buddy explains!

The straight part
We know that "in keeping with the time" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in keeping with the time = seasonable.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 SEASONABLE mean?
SEASONABLE adjective- Opportune; occurring at an appropriate or suitable time.
- Appropriate to the current season of the year.
- Ephemeral; lasting for just one season.
- In season (said of game when it is legal to be hunted and killed).
- Well-seasoned; matured (e.g. timber).