Inexperienced magician with no time for London Town (9)
I believe the answer is:
greenwich
'london town' is the definition.
'inexperienced magician with no time' is the wordplay.
'inexperienced' becomes 'green' (similar in meaning).
'magician' becomes 'witch'.
'with no' suggests deleting specific letters.
'time' becomes 't' (abbreviation).
'witch' with 't' taken out is 'wich'.
'green'+'wich'='GREENWICH'
'for' acts as a link.
(Other definitions for greenwich that I've seen before include "London suburb associated with Mean Time" , "Zero degrees of longitude runs through the London borough" , "Prime meridian site" , "origin of time" , "London borough, site of the Royal Observatory" .)