TV remote button (5)
'tv remote button' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mute that I've seen before include "Silent, not talking" , "Unspeaking" , "Silent, refraining from speaking" , "Silence" , "Silent - dumb" .)
(Other definitions for rec that I've seen before include "pleasure area" , "record" , "play area" , "place for outdoor games" , "Recreation ground (informal)" .)
(Other definitions for pause that I've seen before include "Hesitate; delay" , "Short break" , "Short delay" , "Temporary cessation" , "Intermission" .)