Crossword Genius

Economist who creates barriers? (4,5)

Ross

I believe the answer is:

adam smith

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

'economist' is the definition.
(18th-century economist)

'creates barriers?' is the wordplay.
I cannot really understand how this works, but
'barriers?' could be 'dams' (dam is a kind of barrier) and 'dams' is present in the answer.
This explanation may well be incorrect...

'who' acts as a link.

Can you help me to learn more?

(Other definitions for adam smith that I've seen before include "Economist" , "The Wealth of Nations author" , "Moral philosopher" , "Advocate of free trade" .)

I've seen this clue in The Independent.
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