Corner immediately after turning right (4)
I believe the answer is:
nook
'corner' is the definition.
(synonyms)
'immediately after turning right' is the wordplay.
'immediately after' becomes 'on' ('on' can mean 'after' or 'following' in time).
'turning' is a reversal indicator.
'right' becomes 'ok' (OK can mean right or appropriate).
'on' in reverse letter order is 'no'.
'no'+'ok'='NOOK'
(Other definitions for nook that I've seen before include "Sheltered corner" , "Quiet corner" , "Small space" , "Recess offering seclusion" , "Interior angle formed where two walls meet" .)