Second of Fijian houses overthrown (4)
I believe the answer is:
jiff
'second' is the definition.
(I've seen this before)
'of fijian houses overthrown' is the wordplay.
'houses' says the answer is hidden in the clue (part of the clue houses the answer).
'overthrown' says the letters should be written in reverse.
'ffij' is hidden within 'of fijian'.
'ffij' written backwards gives 'JIFF'.
(Other definitions for jiff that I've seen before include "Second" , "A mo" , "Instant (sl)" , "Two shakes" .)