Catch, all fingers and thumbs facing up? (3)
I believe the answer is:
net
'catch' is the definition.
(I know that net is a type of catch)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for net that I've seen before include "What separates court opponents" , "Meshwork" , "After expenses" , "Catch -- after all deductions" , "Fish-catching mesh" .)