Thought advice restricts writers (4-3,4)

I believe the answer is:

felt-tip pens

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'thought advice restricts writers' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'thought advice restricts writers' is the wordplay.
'thought' becomes 'felt' (feeling is a kind of thinking).
'advice' becomes 'tips' (I've seen this in another clue).
'restricts' means to remove the last letter (I've seen 'restricted' mean this (restricted can mean limited or reduced)).
'writers' becomes 'pens' (writing implements).
'tips' with its final letter taken away is 'tip'.
'felt'+'tip'+'pens'='FELT-TIP PENS'

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I've seen this clue in The Times.

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