Say to the people turning it on (7)
I believe the answer is:
mention
'say' is the definition.
(I know that mention is a more specific form of the action say)
'the people turning it on' is the wordplay.
'the people' becomes 'men' (men are people).
'turning' says the letters should be written in reverse.
'it' in reverse letter order is 'ti'.
'men'+'ti'+'on'='MENTION'
'to' acts as a link.
(Other definitions for mention that I've seen before include "Allude to" , "Speak of - refer to" , "Briefly refer to (something)" , "state" , "Passing reference" .)