Rob's dog ignoring parent (5)
I believe the answer is:
stiff
'parent' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for stiff that I've seen before include "Not giving" , "Starched, rigid" , "Formal" , "Not easily bent" , "Awkward" .)