The most common and most likely answer to this crossword clue is the 5 letter word SNOUT
I've seen this crossword clue in The Daily Telegraph
S
N
O
U
T
More clues leading to the result SNOUT
- From outskirts of Swindon, inaccurate informer
- Grass snake’s first and last to waken in the field
- Tin with old-fashioned tobacco
- Prisoner’s baccy in tin with refill needed
- Partners playing on public grass
- I can smell tobacco
- Tobacco in can — lots rejected
- Tobacco tin open
- Tobacco tin not in use
- Smokes when in prison
Buddy explains!

The straight part
We know that "Tobacco" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tobacco = snout.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 SNOUT mean?
SNOUT noun- The long, projecting nose, mouth, and jaw of a beast, as of pigs.
- The front of the prow of a ship or boat.
- A person's nose.
- The nozzle of a pipe, hose, etc.
- The anterior prolongation of the head of a gastropod; a rostrum.
- The anterior prolongation of the head of weevils and allied beetles; a rostrum.
- Tobacco; cigarettes.
- The terminus of a glacier.
- A police informer.
- A butterfly in the nymphalid subfamily Libytheinae, notable for the snout-like elongation on their heads.
- To furnish with a nozzle or point.