Emblem, behold, was overpromoted in East End? (8)
I believe the answer is:
logotype
'emblem' is the definition.
(thesaurus)
'behold was overpromoted in east end?' is the wordplay.
I cannot quite understand how this works, but
'behold' could be 'lo' ('lo' is an archaic exclamation meaning 'look!') and 'lo' is found in the answer.
'east' could be 'e' (synonyms) and 'e' is located in the answer.
'end?' could be 'go' (going is a kind of ending) and 'go' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for logotype that I've seen before include "Printing block" , "Identifying symbol" , "time-saving device at printer's" .)