Called singer that fronts Zeppelin (6)
I believe the answer is:
titled
'called' is the definition.
(titling is a kind of calling)
'singer that fronts zeppelin' is the wordplay.
'singer' becomes 'tit' (type of songbird).
'that fronts zeppelin' becomes 'led' (I am not sure about this - if you are sure you should believe this answer much more).
'tit'+'led'='TITLED'
Can you help me to learn more?
(Other definitions for titled that I've seen before include "Named" , "peer?" , "Upper-class" , "Noble" , "Given a name" .)