Declaration of doorman, one bringing in goods (8)
I believe the answer is:
importer
'one bringing in goods' is the definition.
(I've seen this before)
'declaration of doorman' is the wordplay.
'declaration of' becomes 'im' (I am not sure about this - if you are sure you should believe this answer much more).
'doorman' becomes 'porter' (synonyms).
'im'+'porter'='IMPORTER'
Can you help me to learn more?
(Other definitions for importer that I've seen before include "Foreign dealer" , "A trader in foreign goods" , "One bringing in goods to country" , "One buys in" , "Businessperson" .)