The same London allotment has this fruit (5)
I believe the answer is:
melon
'this fruit' is the definition.
(type of fruit)
'the same london allotment has' is the wordplay.
'has' indicates a hidden word.
'MELON' can be found hidden inside 'same london allotment'.
(Other definitions for melon that I've seen before include "Sweet juicy fruit" , "Honeydew fruit" , "Killing" , "Type of fruit" , "Ogen or cantaloupe, for instance" .)