Criticise work, largely empty, but a brilliant display (7)
I believe the answer is:
panoply
'a brilliant display' is the definition.
'panoply' can be an answer for 'display' (I have seen 'Impressive display ' mean 'panoply' so perhaps 'display' could also mean 'panoply'). I am not sure about the 'a brilliant' bit.
'criticise work largely empty' is the wordplay.
'criticise' becomes 'pan' (informal term meaning to criticise heavily).
'work' becomes 'op' (abbreviation for opus).
'empty' says to hollow out the word (remove centre letters).
'largely' with its centre removed is 'ly'.
'pan'+'op'+'ly'='PANOPLY'
'but' is the link.
Can you help me to learn more?
(Other definitions for panoply that I've seen before include "Wide range" , "A complete or splendid array" , "Having full equipment" , "brilliant array" , "Full array, armour" .)