A street in play, comfortable and warm (6)
I believe the answer is:
toasty
'warm' is the definition.
(I've seen this before)
'a street in play' is the wordplay.
'street' becomes 'st' (abbreviation).
'in' means one lot of letters goes inside another.
'play' becomes 'toy' (synonyms).
'a'+'st'='ast'
'ast' inserted within 'toy' is 'TOASTY'.
'comfortable and' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for toasty that I've seen before include "Hot food" , "Pleasantly warm" , "snack" , "Cosily warm" , "nice and warm?" .)