Even with a woolly head, a sheep can always get there (6)
I believe the answer is:
wether
'a sheep can always get there' is the definition.
I can't tell whether this definition defines the answer.
'even with a woolly head' is the wordplay.
'even' becomes 'ether' (I can't explain this - if you can you should believe this answer much more).
'with' means one lot of letters go next to another.
'head' suggests taking the first letters.
The first letter of 'woolly' is 'w'.
'ether' put after 'w' is 'WETHER'.
Can you help me to learn more?
(Other definitions for wether that I've seen before include "Castrated 22dn" , "Castrated sheep" , "Castrated ram" , "Male sheep" .)