Chap reflecting every second of long hush (4)
I believe the answer is:
hugo
'chap' is the definition.
'reflecting every second of long hush' is the wordplay.
'reflecting' says the letters should be written backwards.
'every second of' means one should take alternating letters.
'long'+'hush'='longhush'
The alternate letters of 'longhush' are 'oguh'.
'oguh' written backwards gives 'HUGO'.
(Other definitions for hugo that I've seen before include "Victor maybe" , "Victor, say" , "Fr. Author; Sci-fi award" , "Victor ---; --- Wolf" , "French romantic writer, Victor, d. 1885" .)