Keeps quiet about a temperature showing changes (7)

I believe the answer is:

mutates

'changes' is the definition.
(to mutate is to change or transform)

'keeps quiet about a temperature' is the wordplay.
'keeps quiet' becomes 'mutes' (to mute something is to make it quiet).
'about' is an insertion indicator.
'temperature' becomes 't' (abbreviation).
'a'+'t'='at'
'mutes' going around 'at' is 'MUTATES'.

'showing' is the link.

(Another definition for mutates that I've seen is " Changes into something else".)

I've seen this clue in The Times.

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