Are such watches not handy? (7)

I believe the answer is:
digital
'handy?' is the definition.
Although both the answer and definition are adjectives, I can't see how they can define each other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for digital that I've seen before include "Opposite of analogue" , "Of watch, showing time in numbers" , "Relating to fingers" , "Showing data in numbers" , "of modern clock?" .)
