Car safety feature put on that is something a mouse can move (6,3)

I believe the answer is:

scroll bar

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'something a mouse can move' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'car safety feature put on that is' is the wordplay.
'car safety feature' becomes 'roll bar' (I've seen this in another clue).
'put on' is a charade indicator (letters next to each other) (some letters go on or after others).
'that is' becomes 'sc' (abbreviation for Latin scilicet meaning 'namely').
'rollbar' after 'sc' is 'SCROLL BAR'.

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I've seen this clue in The Times.

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