Advantage of having a superior worker? (5,4)
I believe the answer is:
upper hand
'advantage of' is the definition.
'upper hand' can be an answer for 'advantage' (thesaurus). I'm not certain of the 'of' bit.
'a superior worker?' is the wordplay.
'a superior' becomes 'upper' (eg an upper house in a parliament).
'worker?' becomes 'hand' (hand is a kind of worker).
'upper'+'hand'='UPPER HAND'
'having' acts as a link.
Can you help me to learn more?
(Other definitions for upper hand that I've seen before include "Mastery, advantage" , "not usually right for driver" , "superiority" , "Superior position" , "Position of advantage and control" .)