Openly condemn lair with leopard (8)
I believe the answer is:
denounce
'openly condemn' is the definition.
(I've seen this before)
'lair with leopard' is the wordplay.
'lair' becomes 'den' (synonyms).
'with' says to put letters next to each other.
'leopard' becomes 'ounce' (I can't explain this - if you can you should give a lot more credence to this answer).
'den'+'ounce'='DENOUNCE'
Can you help me to learn more?
(Other definitions for denounce that I've seen before include "attack" , "Speak publicly against, expose" , "Openly deplore" , "Condemn publicly" , "Accuse publicly" .)