Crossword Genius

Unfasten lid of vehicle without roof (4-3)

Ross

I believe the answer is:

open-top

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'vehicle without roof' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'unfasten lid' is the wordplay.
'unfasten' becomes 'open' (I've seen this before).
'lid' becomes 'top' (eg a bottle top).
'open'+'top'='OPEN-TOP'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for open-top that I've seen before include "Lacking cover" , "(Of car) not having a permanent roof" , "Like some tourist buses" .)

I've seen this clue in The Irish Times.
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