Strengthened, nonetheless hairy? (10)
I believe the answer is:
buttressed
'strengthened' is the definition.
(buttressing is a kind of strengthening)
'nonetheless hairy?' is the wordplay.
'nonetheless' becomes 'but' (I've seen this in another clue).
'hairy?' becomes 'tressed' (I can't explain this - if you can you should believe this answer much more).
'but'+'tressed'='BUTTRESSED'
Can you help me to learn more?
(Other definitions for buttressed that I've seen before include "held securely" , "Supported" , "Reinforced" .)