Married Yoko, proud every now and then to get out camera attachment (7)
I believe the answer is:
monopod
'camera attachment' is the definition.
(a monopod holds a camera)
'married yoko proud every now and then to get out' is the wordplay.
'married' becomes 'm'.
'yoko' becomes 'ono' (musician Yoko Ono).
'every now and then to get out' means one should take alternating letters (letters taken out at regular intervals).
The alternate letters of 'proud' are 'pod'.
'm'+'ono'+'pod'='MONOPOD'
(Other definitions for monopod that I've seen before include "One-legged stand" , "Type of camera support" .)