The most common and most likely answer to this crossword clue is the 7 letter word SLEIGHT
I've seen this crossword clue in The Daily Telegraph
S
L
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More clues leading to the result SLEIGHT
- Cunning vehicle for winter trekkers primarily
- Reportedly insignificant skill
- Cunning Earl involved in insult
- Strategem that's rather trivial in hearing
- Cunning dexterity of small and large rowing team
- European ensnared in small deception
- Dexterity inappreciable, from what we hear
- Trickery requiring present transport to be on time
- During lecture deliberately overlook deception
- Cunning in emptying small cube
Buddy explains!

The straight part
We know that "manual dexterity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case manual dexterity = sleight.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 SLEIGHT mean?
SLEIGHT noun- Cunning; craft; artful practice.
- An artful trick; sly artifice; a feat so dexterous that the manner of performance escapes observation.
- Dexterous practice; dexterity; skill.