Pressurises one's employees but does nothing oneself (4,2,4,5)
I believe the answer is:
sits on ones hands
'does nothing oneself' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'pressurises one's employees' is the wordplay.
'pressurises' becomes 'sitson' (I can't justify this - if you can you should give a lot more credence to this answer).
'employees' becomes 'hands' (hand is a kind of employee).
'sitson'+'ones'+'hands'='SITS ON ONES HANDS'
'but' acts as a link.
Can you help me to learn more?
(Other definitions for sits on ones hands that I've seen before include "takes no further action" , "Keeps workers in check" .)