Item worn cycling has approval in review (5)
I believe the answer is:
shako
'item worn' is the definition.
(type of military headwear)
'cycling has approval in review' is the wordplay.
'cycling' indicates an anagram.
'approval' becomes 'ok' (OK is an example**).
'in review' says the letters should be written in reverse.
'ok' in reverse letter order is 'ko'.
'has' anagrammed gives 'sha'.
'sha'+'ko'='SHAKO'
(Other definitions for shako that I've seen before include "Cylindrical military hat with peak and plume? Really has, ok" , "Ceremonial hat" , "Plumed military cap" , "old military item" , "Tall plumed hat (mil.)" .)