Telly giant (with "the”) (4)
I believe the answer is:
beeb
'telly giant with the' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for beeb that I've seen before include "Auntie (slang, palindrome)" , "Old microcomputer" , "Informally, the British broadcasting service" , "It broadcasts" , "British Broadcasting Corporation (popularly)" .)