Cub leader has grease around head (7)
I believe the answer is:
lioness
'cub leader' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'grease around head' is the wordplay.
'grease' becomes 'oil' (I've seen this before).
'around' says the letters should be written backwards.
'head' becomes 'ness' (type of geographical point).
'oil' written backwards gives 'lio'.
'lio'+'ness'='LIONESS'
'has' is the link.
Can you help me to learn more?
(Other definitions for lioness that I've seen before include "Brave woman" , "predatory female'" , "Big beast's mate" , "Predator" , "Beast" .)