Beam, seeing part of Carousel in telecast (6)
I believe the answer is:
lintel
'beam' is the definition.
(lintel is a kind of beam)
'part of carousel in telecast' is the wordplay.
'part of' indicates a hidden word.
'LINTEL' can be found hidden inside 'carousel in telecast'.
'seeing' acts as a link.
(Other definitions for lintel that I've seen before include "Support across the top of a door" , "support is needed" , "Supporting member" , "Horizontal beam over a door or window" , "Support across doorway" .)