Row on air from time to time (3)
I believe the answer is:
oar
'row' is the definition.
(oar can mean to row with oars)
'on air from time to time' is the wordplay.
'from time to time' means one should take alternating letters (letters removed on a regular basis).
'on'+'air'='onair'
The alternate letters of 'onair' are 'OAR'.
(Other definitions for oar that I've seen before include "Implement to propel a boat" , "Sweep" , "that may be feathered?" , "Propelling blade" , "Bladed pole" .)