The most common and most likely answer to this crossword clue is the 6 letter word DAISES
I've seen this crossword clue in Independent
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More clues leading to the result DAISES
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The straight part
We know that "platforms" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case platforms = daises.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DAISES mean?
DAISES noun- A raised platform in a room for a high table, a seat of honour, a throne, or other dignified occupancy; a similar platform supporting a lectern, pulpit, etc., which may be used to speak from.
- A bench, a settle, a pew.
- An elevated table in a hall at which important people were seated; a high table.
- The canopy over an altar, etc.