Coins such as 50p pieces in circulation (6)

I believe the answer is:

specie

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

'coins' is the definition.
(I've seen this in another clue)

'as 50p pieces in circulation' is the wordplay.
'pieces' anagrams to 'SPECIE'.
However, I'm not clear how this is indicated.

'such' acts as a link.

Can you help me to learn more?

(Other definitions for specie that I've seen before include "Money as coins" , "Coinage, metal money" , "Coin as opposed to paper money" , "Broken pieces for coined money" , "Money in the form of coin" .)

I've seen this clue in The Telegraph.

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