Replacement parts for a press? (6)

I believe the answer is:

spares

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'replacement' is the definition.
(thesaurus)

'parts for a press?' is the wordplay.
'a press' can be anagrammed to 'SPARES'.
However, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for spares that I've seen before include "Extras in case of necessity" , "Replacement items, like tyres" , "Lets off; reserve parts" , "Extras with spears" , "Is merciful towards, refrains from hurting" .)

I've seen this clue in The Globe and Mail.

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