Fuss over nasty smell in Filipino dish (5)
I believe the answer is:
adobo
'filipino dish' is the definition.
(I've seen this in another clue)
'fuss over nasty smell in' is the wordplay.
'fuss' becomes 'ado' (synonyms).
'over' says the letters should be written backwards.
'nasty smell' becomes 'B.O.' (body odour).
'in' indicates putting letters inside.
'bo' written backwards gives 'ob'.
'ado' enclosing 'ob' is 'ADOBO'.
(Other definitions for adobo that I've seen before include "Filipino meat dish" , "Filipino dish is served" .)