Unhappy to have head dropping commercials (3)
I believe the answer is:
ads
'commercials' is the definition.
(advertisements)
'unhappy to have head dropping' is the wordplay.
'unhappy' becomes 'as' (I can't justify this - if you can you should give a lot more credence to this answer).
'to have' means one lot of letters goes inside another.
'head' suggests taking the first letters.
The first letter of 'dropping' is 'd'.
'as' placed around 'd' is 'ADS'.
(Other definitions for ads that I've seen before include "Promotions" , "Notices" , "Classifieds (abbr)" , "Commercials" .)