It's not far, only just around the end of the street (5)
I believe the answer is:
metre
'it's not far only' is the definition.
I can't tell whether this defines the answer.
'just around the end of the street' is the wordplay.
'just' becomes 'mere' ('just' can mean 'mere' or 'only').
'around' is an insertion indicator.
'the end of the' indicates one should take the final letters.
The last letter of 'street' is 't'.
'mere' enclosing 't' is 'METRE'.
Can you help me to learn more?
(Other definitions for metre that I've seen before include "Basic unit of length" , "100cm" , "Distance" , "Yard is smaller than this" , "Characteristic of feet" .)