Reservations over lawyer bearing extremely short hair (7)
I believe the answer is:
stubble
'extremely short hair' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'reservations over lawyer bearing' is the wordplay.
'reservations over' becomes 'stub' (I can't justify this - if you can you should give a lot more credence to this answer).
'lawyer' becomes 'bl' (I've seen this in other clues).
'bearing' becomes 'e'.
'stub'+'bl'+'e'='STUBBLE'
Can you help me to learn more?
(Other definitions for stubble that I've seen before include "Post-harvest stalks" , "Short stiff hairs on a man's face before a shave" , "Short stiff growth - needs a shave" , "Stalks left by harvester" , "Cut cereal stalks" .)