Hairless labrador knocked over daughter (4)
I believe the answer is:
bald
'hairless' is the definition.
(similar in meaning)
'labrador knocked over daughter' is the wordplay.
'labrador' becomes 'lab' (I am not sure about this - if you are sure you should believe this answer much more).
'knocked over' shows that the letters should be reversed in order.
'daughter' becomes 'd' (genealogical abbreviation).
'lab' in reverse letter order is 'bal'.
'bal'+'d'='BALD'
Can you help me to learn more?
(Other definitions for bald that I've seen before include "Lacking hair on the head" , "Lacking hair on the scalp" , "Not covered with hair" , "With no effort to conceal" , "Without the natural covering" .)