Cosy pad in Newcastle street? (4)
I believe the answer is:
nest
'cosy pad' is the definition.
(cosy residence)
'newcastle street?' is the wordplay.
'newcastle' becomes 'ne' (I've seen this in other clues).
'street?' becomes 'st' (abbreviation).
'ne'+'st'='NEST'
'in' acts as a link.
(Other definitions for nest that I've seen before include "Bird's retreat" , "Eyrie" , "Accommodation for hobby, say" , "comfortable residence" , "See 21" .)