The fellow given notice — and the boss giving it? (4)
I believe the answer is:
head
'the fellow' is the definition.
(thesaurus)
'notice and the boss giving it?' is the wordplay.
'notice' becomes 'ad' (both can mean an advertisement).
'and' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the boss giving' becomes 'h' (I can't explain this - if you can you should give a lot more credence to this answer).
'it?' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'h'+'e'='he'
'ad' after 'he' is 'HEAD'.
'given' is the link.
(Other definitions for head that I've seen before include "Person in charge" , "River or stream source" , "Chief; part of body" , "Leader; stream source" , "Promontory; foam" .)