The most common and most likely answer to this crossword clue is the 4 letter word SHOP
I've seen this crossword clue in The Guardian
S
H
O
P
More clues leading to the result SHOP
- Rat on boat one dislodged by duck
- Retail outlet quiet before work
- Give away retail unit
- Blow the whistle on store
- Store grass up
- Don’t talk work, which talking this is
- Panel identifying grasses within hedging west of green
- Quiet work in retail outlet
- Talking posh may also be frowned upon
- Winnie’s back, missing ring finger
Buddy explains!

The straight part
We know that "finger" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case finger = shop.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 SHOP mean?
SHOP noun- An establishment that sells goods or services to the public; originally only a physical location, but now a virtual establishment as well.
- A place where things are manufactured or crafted; a workshop.
- A large garage where vehicle mechanics work.
- Workplace; office. Used mainly in expressions such as shop talk, closed shop and shop floor.
- A variety of classes taught in junior or senior high school that teach vocational skill.
- An establishment where a barber or beautician works.
- An act of shopping, especially routine shopping for food and other domestic supplies.
- Discussion of business or professional affairs.
- To visit stores or shops to browse or explore merchandise, especially with the intention of buying such merchandise.
- To purchase products from (a range or catalogue, etc.).
- To report the criminal activities or whereabouts of someone to an authority.
- To imprison.
- To photoshop; to digitally edit a picture or photograph.
- Used to attract the services of a shop assistant