The most common and most likely answer to this crossword clue is the 7 letter word THUMBED
I've seen this crossword clue in The Guardian
T
H
U
M
B
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Buddy explains!

The straight part
We know that "fingered" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fingered = thumbed.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 THUMBED mean?
THUMBED verb- To touch or cover with the thumb.
- (with through) To turn the pages of (a book) in order to read it cursorily.
- (travel) To hitchhike
- To soil or wear with the thumb or the fingers; to soil, or wear out, by frequent handling.
- To manipulate (an object) with the thumb; especially, to pull back the hammer or open the cylinder of a revolver.
- To fire (a single action revolver) quickly by pulling the hammer while keeping the trigger depressed.
- (in combination) Having some specific type of thumb.