The most common and most likely answer to this crossword clue is the 7 letter word POINTER
I've seen this crossword clue in The Sunday Telegraph
P
O
I
N
T
E
R
More clues leading to the result POINTER
- Playwright Harold kennels old dog
- Nothing disturbing the playwright’s dog
- Dog lead
- Might this indicate a dog?
- Playwright Harold entertains circle to offer piece of advice
- Dog clue
- Dog or horse or something moved by mouse
- Orient, possibly, at the outset after clarifying advice
- Dog lead
- Dramatist retains nothing that might give a clue
Buddy explains!

The straight part
We know that "Canine/tip" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case canine/tip = pointer.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 POINTER mean?
POINTER noun- Anything that points or is used for pointing.
- A teacher's pointer, pointing stick, a rod with an arrow.
- A needle-like component of a timepiece or measuring device that indicates the time or the current reading of the device.
- A breed of hunting dog, trained to point out game.
- A variable that holds the address of a memory location where a value can be stored.
- An icon that indicates the position of the pointing device, such as a mouse.
- (chiefly in the plural) A tip, a bit of advice.
- (in combinations) Something worth a given number of points.