I'm opposed to granny dating, essentially (4)
I believe the answer is:
anti
'i'm opposed' is the definition.
I can't judge whether this defines the answer.
'granny dating essentially' is the wordplay.
'granny' becomes 'an' (I can't explain this - if you can you should believe this answer much more).
'essentially' says to take the centre.
The central letters of 'dating' are 'ti'.
'an'+'ti'='ANTI'
'to' is the link.
Can you help me to learn more?
(Other definitions for anti that I've seen before include "on the other side" , "Someone opposed (to a policy?)" , "An opponent - opposed to party policy, etc" , "[NO MAN]" , "Prefix meaning against" .)