Relaxes on streets (5)
I believe the answer is:
rests
'relaxes' is the definition.
(I've seen this before)
'on streets' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'streets' becomes 'sts' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
're'+'sts'='RESTS'
Can you help me to learn more?
(Other definitions for rests that I've seen before include "holidays" , "Musical pauses" , "Takes one's ease" , "Relaxes, sleeps" , "Pauses; relaxes" .)