Excessive fondness for senility? (6)
I believe the answer is:
dotage
This clue is a double definition.
'excessive fondness' is the first definition.
(I've seen this in another clue)
'senility?' is the second definition.
(I know that senility can be written as dotage)
'for' acts as a link.
(Other definitions for dotage that I've seen before include "Senile years" , "Foolish infatuation" , "Mental infirmity in old age" , "Feeble-minded period late in life" , "Old age, senility" .)