Confinement for the very young drama writer (7)

I believe the answer is:

playpen

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'confinement for the very young' is the definition.
I can't judge whether this definition defines the answer.

'drama writer' is the wordplay.
'drama' becomes 'play' (synonyms).
'writer' becomes 'pen' (something which writes).
'play'+'pen'='PLAYPEN'

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(Other definitions for playpen that I've seen before include "Baby enclosure" , "Limited room for amusement" , "device to capture the young" , "Nipper stuck here" , "Enclosure for child" .)

I've seen this clue in The Times.

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