Abandon principal type of convertible (8)

I believe the answer is:

drophead

'type of convertible' is the definition.
(drophead can mean a convertible car)

'abandon principal' is the wordplay.
'abandon' becomes 'drop' (I've seen this in another clue).
'principal' becomes 'head' (synonyms).
'drop'+'head'='DROPHEAD'

I've seen this clue in The Times.

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