To me, half London can be at the waterside! (5)
I believe the answer is:
melon
'be at the waterside' is the definition.
I can't judge whether this defines the answer.
'to me half london' is the wordplay.
'half' suggests halving the letters.
'london' halved is 'lon'.
'me'+'lon'='MELON'
'can' is the link.
Can you help me to learn more?
(Other definitions for melon that I've seen before include "Cantaloupe fruit" , "Large sweet gourd" , "Sweet juicy fruit" , "Fruit - lemon (anag)" , "Gourdlike fruit" .)