They amuse most of the boys at the end of the street (4)
I believe the answer is:
toys
'they amuse most of' is the definition.
The definition suggests an adverb but the answer is not.
'boys at the end of the street' is the wordplay.
'boys' becomes 'oys' (I can't explain this - if you can you should believe this answer much more).
'at' says to put letters next to each other (I've seen this in other clues).
'the end of the' indicates one should take the final letters.
The final letter of 'street' is 't'.
'oys' put after 't' is 'TOYS'.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for toys that I've seen before include "Plays (with something), not seriously" , "Children's playthings" , "Sports" , "Small dogs" , "Fiddles" .)