Pair filmed briefly moving part of roadie’s kit? (9)
I believe the answer is:
amplifier
'part of roadie's kit?' is the definition.
(a roadie might bring an amplifier to a concert)
'pair filmed briefly moving' is the wordplay.
'briefly' means to remove the last letter.
'moving' is an anagram indicator.
'pair'+'filmed'='pairfilmed'
'pairfilmed' with its final letter taken away is 'pairfilme'.
'pairfilme' with letters rearranged gives 'AMPLIFIER'.
(Other definitions for amplifier that I've seen before include "It intensifies" , "Device to boost sound levels" , "Device that strengthens" , "Signal booster" , "Loudspeaker driver" .)