Shocked, calls business receiving millions (10)
I believe the answer is:
dumbstruck
'shocked' is the definition.
Both the answer and definition are adjectives.
Perhaps you can see an association between them that I don't see?
'calls business receiving millions' is the wordplay.
'calls' becomes 'dubs' (dubbing is a kind of calling).
'business' becomes 'truck' (dealings, as in 'having no truck with' something).
'receiving' is an insertion indicator.
'millions' becomes 'm' (abbreviation).
'dubs'+'truck'='dubstruck'
'dubstruck' placed around 'm' is 'DUMBSTRUCK'.
Can you help me to learn more?
(Other definitions for dumbstruck that I've seen before include "Temporarily deprived of speech by shock" , "Speechless with amazement" , "Gobsmacked" .)