Internally typecasting cranky, unlovable amorous adventurer (8)

I believe the answer is:

casanova

I'm a little stuck... Click here to teach me more about this clue!

'amorous adventurer' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for casanova that I've seen before include "Notorious lover" , "Notorious Italian womaniser of 18th century" , "Man noted for his amorous adventures" , "Lady-killer" , "Famous Italian" .)

I've seen this clue in The Irish Times.

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