To love is just as well (3)
I believe the answer is:
too
'as well' is the definition.
(both can mean 'also')
'to love is' is the wordplay.
I cannot quite understand how this works, but
'to' is within the answer.
'love' could be 'o' (love means zero in tennis) and 'o' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'just' is the link.
Can you help me to learn more?
(Other definitions for too that I've seen before include "Moreover, in addition" , "Unduly" , "What a pity!" , "To a greater than desirable extent" , "Excessively" .)