One hollow logo on the box (5)
I believe the answer is:
ident
'logo on the box' is the definition.
(sequence on television to identify the channel)
'one hollow' is the wordplay.
'one' becomes 'i' (Roman numeral).
'hollow' becomes 'dent' (both can mean an impression or indentation).
'i'+'dent'='IDENT'
(Other definitions for ident that I've seen before include "short film sequence" , "image on screen" , "Short BBC sequence" , "Broadcast indicating TV channel" , "not much, which shows your station" .)