What does the cryptic crossword clue "Firm support for some office equipment (6)" mean?

The definition is "office equipment". The wordplay uses a charade (building blocks). CO (abbreviation="Firm") + PIER (synonym="support") = COPIER; definition: "office equipment" The answer is Copier.

Firm support for some office equipment (6)

Telegraph #28073 | 8 Down | 2016-03-28 flower

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Also seen in

Guardian Cryptic #24052 (2007-04-16)