Insecure, unloved animal (3)

I believe the answer is:

cur

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

This might be a double definition.

'insecure' is the first definition.
(in the letters 'seCURe')

'unloved animal' is the second definition.
'cur' can be an answer for 'animal' (thesaurus). I am not certain of the 'unloved' bit.

Can you help me to learn more?

(Other definitions for cur that I've seen before include "Mangy dog" , "Poor dog" , "Useless dog" , "Mongrel - cowardly person" , "Miserable dog" .)

I've seen this clue in the Evening Standard.

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