Business is over-rated (5)

I believe the answer is:

trade

I'm a little stuck... Click here to teach me more about this clue!

'business' is the definition.
(I know that trade is a type of business)

'over-rated' is the wordplay.
'rated' anagrams to 'TRADE'.
Though, I'm not clear how this is indicated.

'is' is the link.

Can you help me to learn more?

(Other definitions for trade that I've seen before include "Commercial dealings" , "Deal - occupation" , "Dealings, business" , "Give and receive (blows)" , "Personal occupation" .)

I've seen this clue in The Irish Independent.

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