Added text rarely shows (5)
I believe the answer is:
extra
'added' is the definition.
(similar in meaning)
'text rarely shows' is the wordplay.
'shows' indicates a hidden word.
'EXTRA' is hidden within 'text rarely'.
(Other definitions for extra that I've seen before include "Bit actor in movie's crowd scenes" , "Spare" , "There's more" , "An increased amount" , "Possibly overthrow" .)