Complete updates, just the thing to stop whistle-blowers (6)

I believe the answer is:

refits

'complete updates' is the definition.
(a refit is a complete update)

'just the thing to stop whistle-blowers' is the wordplay.
'just the thing' becomes 'it' ('that's it!').
'to stop' indicates putting letters inside.
'whistle-blowers' becomes 'refs' (referees blow whistles).
'it' put into 'refs' is 'REFITS'.

(Another definition for refits that I've seen is " Repairs".)

I've seen this clue in The Guardian.

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