What is more, it can be taken out of context randomly (5)

I believe the answer is:
extra
'what is more' is the definition.
(I've seen this in another clue)
'of context randomly' is the wordplay.
'of' indicates a hidden word.
'EXTRA' is hidden in the letters of 'context randomly'.
'it can be taken out' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for extra that I've seen before include "Accessory" , "I may carry spear" , "Bit-part actor" , "One in crowd scene" , "leg bye perhaps" .)
