Crossword Genius

Replace hot part of motor with silver, then activate (6)

Ross

I believe the answer is:

change

I'm a little stuck... Click here to teach me more about this clue!

I believe this is a quadruple definition!!

'replace' is the first definition.
(I know that replace is a more specific form of change)

'hot part of motor' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'with' acts as a link.

'silver' is the third definition.
(I've seen this in another clue)

'then' acts as a link.

'activate' is the fourth definition.
(I know that activate is a more specific form of change)

Can you help me to learn more?

(Other definitions for change that I've seen before include "we vary our routine for one" , "Make or become different" , "It's said to be as good as a rest" , "Innovation" , "Transfer" .)

I've seen this clue in The Irish Times.
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