Crossword Genius

First of gold bullion exchanged for protein (8)

Ross

I believe the answer is:

globulin

'protein' is the definition.
(globulin is a kind of protein)

'first of gold bullion exchanged' is the wordplay.
'first of' says to take the initial letters.
'exchanged' indicates an anagram.
The first letter of 'gold' is 'g'.
'bullion' anagrammed gives 'lobulin'.
'g'+'lobulin'='GLOBULIN'

'for' acts as a link.

(Another definition for globulin that I've seen is " Protein found in blood".)

I've seen this clue in The Telegraph.
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