Substitute meat with fish soup, kilo being consumed (9)
I believe the answer is:
makeshift
'substitute' is the definition.
(thesaurus)
'meat with fish soup kilo being consumed' is the wordplay.
'with' means one lot of letters go next to another.
'soup' is an anagram indicator.
'kilo' becomes 'k' (phonetic alphabet: alpha, bravo, charlie etc.).
'being consumed' means one lot of letters goes inside another.
'meat' after 'fish' is 'fishmeat'.
'fishmeat' is an anagram of 'maeshift'.
'maeshift' going around 'k' is 'MAKESHIFT'.
(Other definitions for makeshift that I've seen before include "stopgap" , "this'll do for now" , "Interim, temporary" , "(Acting as) temporary substitute" , "temporary expedient" .)