Like Spock's mother (5)
I believe the answer is:
human
'like spock's mother' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for human that I've seen before include "Anthropoid" , "Like a real person" , "Mortal; compassionate" , "likely to err?" , "Of the species of homo sapiens" .)