Detective Inspector, horny creature having change of heart (5)

I believe the answer is:

morse

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

'detective' is the definition.
(Inspector Morse, fictional detective)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for morse that I've seen before include "& 24 Across Encrypted language" , "TV inspector" , "Endeavour" , "Samuel ---, telegraph inventor" , "used to transmit messages" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app