Walls of emporium foreman, say, put an outstanding design on (6)
I believe the answer is:
emboss
'put an outstanding design on' is the definition.
I can't judge whether this defines the answer.
'walls of emporium foreman' is the wordplay.
'walls of' means to remove the middle letters (the external letters or walls of the word are used).
'foreman' becomes 'boss' (synonyms).
'emporium' with its centre taken out is 'em'.
'em'+'boss'='EMBOSS'
'say' acts as a link.
Can you help me to learn more?
(Other definitions for emboss that I've seen before include "opposite of grave" , "Carve figure in relief" , "Make a raised design on" , "Carve etc so as to raise from surface" , "Decorate with raised design (6)" .)