To rob unreasonably is inhuman (5)

I believe the answer is:

robot

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

'is inhuman' is the definition.
I can't tell whether this definition defines the answer.

'to rob unreasonably' is the wordplay.
'unreasonably' is an anagram indicator (I've seen this in other clues).
'to'+'rob'='torob'
'torob' is an anagram of 'ROBOT'.

Can you help me to learn more?

(Other definitions for robot that I've seen before include "Humanoid machine" , "Mechanism that can move like a human" , "Programmable machine" , "Lifelike machine" , "Automated machine" .)

I've seen this clue in the Evening Standard.

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