Acted silently to curtail dimmer switch (5)

I believe the answer is:

mimed

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'acted silently' is the definition.
'mimed' can be an answer for 'acted' (miming is a kind of acting). I'm unsure of the 'silently' bit.

'curtail dimmer switch' is the wordplay.
'curtail' means to remove the last letter (I've seen 'curtailed' mean this).
'switch' is an anagram indicator.
'dimmer' with its final letter taken off is 'dimme'.
'dimme' is an anagram of 'MIMED'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for mimed that I've seen before include "Took off <" , "made a charade" .)

I've seen this clue in The Mirror.

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