A butcher's can get wrapping rump of steak (4-3)
I believe the answer is:
look-see
'a butcher's' is the definition.
(I've seen this before)
'can get wrapping rump of steak' is the wordplay.
'can' becomes 'loo' (both can informally mean toilet).
'get' becomes 'see' (both can mean to understand).
'wrapping' indicates putting letters inside.
'rump of steak' becomes 'k' (I can't justify this - if you can you should give a lot more credence to this answer).
'loo'+'see'='loosee'
'loosee' going around 'k' is 'LOOK-SEE'.
Can you help me to learn more?
(Other definitions for look-see that I've seen before include "Young's - relates stress and strain (Physics)" , "Brief inspection" , "Inspection (colloq.)" , "Survey, inspection" , "Dekko" .)