Show half of mum's brothers having left (7)
I believe the answer is:
uncover
'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).
'unc'+'over'='UNCOVER'
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" .)