Savalas is seen on it (5)
I believe the answer is:
telly
'savalas' is the definition.
(I've seen this in another clue)
'seen on it' is the wordplay.
'seen' becomes 'elly' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' says to put letters next to each other.
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'elly' after 't' is 'TELLY'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for telly that I've seen before include "Television" , "The goggle-box" , "One of the media" , "'The box' (colloquial)" , "TV (colloq.)" .)