Noticed changes after answer is put into effect (8)

I believe the answer is:

actioned

'is put into effect' is the definition.
(I've seen this before)

'noticed changes after answer' is the wordplay.
'changes' indicates an anagram.
'after' means one lot of letters go next to another.
'answer' becomes 'a' (abbreviation eg in Q and A).
'noticed' anagrammed gives 'ctioned'.
'ctioned' put after 'a' is 'ACTIONED'.

(Another definition for actioned that I've seen is " Put into effect".)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app