Show half of mum's brothers having left (7)
I believe the answer is:
'show' is the definition.
(I know that uncover is a more specific form of the action bring out)
'half of mum's brothers having left' is the wordplay.
'half of mum's brothers' becomes 'unc' (I can't justify this - if you can you should believe this answer much more).
'having' says to put letters next to each other.
'left' becomes 'over' (I've seen this in other clues).
Can you help me to learn more?
(Other definitions for uncover that I've seen before include "Make visible" , "Strip off" , "Expose, reveal" , "Expose, unveil" , "bare" .)