Inferior sort of cow? (5)
I believe the answer is:
lower
This clue might be a double definition.
'inferior' is the first definition.
(similar in meaning)
'sort of cow?' is the second definition.
'lower' can be an answer for 'cow?' (an animal which moos or lows). I'm not sure about the 'sort of' bit.
Can you help me to learn more?
(Other definitions for lower that I've seen before include "where are trousers in relation?" , "subordinate" , "Let or haul down" , "Inferior - scowl" , "Cow" .)