Cosy place, extremely nice, on street (4)
I believe the answer is:
nest
'cosy place' is the definition.
(cosy place for a bird)
'extremely nice on street' is the wordplay.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'on' means one lot of letters go next to another.
'street' becomes 'st' (abbreviation).
'nice' with its middle removed is 'ne'.
'ne'+'st'='NEST'
(Other definitions for nest that I've seen before include "Stack of tables" , "Bird shelter" , "comfortable residence" , "Home to a bird" , "Sent to avian home" .)