Propel cushions onto rocket platforms, maybe? (6-4)

I believe the answer is:

launch-pads

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'rocket platforms maybe?' is the definition.
I can't tell whether this definition defines the answer.

'propel cushions onto' is the wordplay.
'propel' becomes 'launch' (launching is a kind of propelling).
'cushions' becomes 'pads' (I've seen this before).
'onto' means one lot of letters go next to another.
'launch'+'pads'='LAUNCH PADS'

Can you help me to learn more?

I've seen this clue in The Irish Times.

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