Organ needing repairs every so often (3)
I believe the answer is:
ear
'organ' is the definition.
(the ear is an organ)
'repairs every so often' is the wordplay.
'every so often' indicates alternate letters.
The alternating letters of 'repairs' are 'EAR'.
'needing' acts as a link.
(Other definitions for ear that I've seen before include "Aural organ" , "See 24" , "Organ inside heart" , "Van Gogh missing body part" , "Musical ability" .)