Hiccup initially bloated cheek (4)
I believe the answer is:
blip
'hiccup' is the definition.
(I've seen this before)
'initially bloated cheek' is the wordplay.
'initially' indicates taking the first letters.
'cheek' becomes 'lip' (both can mean insolence or rudeness).
The initial letter of 'bloated' is 'b'.
'b'+'lip'='BLIP'
(Other definitions for blip that I've seen before include "Momentary deviation" , "Radar image; minor deviation" , "Signal on a radar screen" , "Minor (and temporary) deviation from trend" , "shows up on radar screen" .)