The most common and most likely answer to this crossword clue is the 7 letter word ENLIVEN
I've seen this crossword clue in The Sunday Telegraph
E
N
L
I
V
E
N
More clues leading to the result ENLIVEN
- Wake up in French quarter — outside as it happens
- Bring excitement to English actor around 50
- Invigorate and put the heart back in metropolitan evil neighbourhood
- Stimulate new learner I put in uniform
- To excite nurse repeatedly, guards left a rude sign?
- Cheer up the Oriental and a couple of Poles admitting wrongdoing in retreat
Buddy explains!

The straight part
We know that "Stimulate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stimulate = enliven.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 ENLIVEN mean?
ENLIVEN verb- To give life or spirit to; to revive or animate.
- To make more lively, cheerful or interesting.