Fond of to some extent (7)
I believe the answer is:
partial
'fond of' is the definition.
(I've seen this before)
'some extent' is the wordplay.
'some' becomes 'part' (only part of something).
'extent' becomes 'ial' (I am not sure about this - if you are sure you should believe this answer much more).
'part'+'ial'='PARTIAL'
'to' is the link.
Can you help me to learn more?
(Other definitions for partial that I've seen before include "Not complete, or with strong liking for" , "Keen" , "Showing favouritism" , "Fragmentary" , "Biased or incomplete" .)