Orders strong cheese to start with (5)
I believe the answer is:
brief
'orders' is the definition.
(instructions given to someone doing a job or task)
'strong cheese to start with' is the wordplay.
'strong' becomes 'f' (musical symbol for 'forte', 'strong' in Italian).
'cheese' becomes 'brie' (Brie is an example).
'to start with' means one lot of letters go next to another.
'f' after 'brie' is 'BRIEF'.
(Other definitions for brief that I've seen before include "scanty" , "Terse" , "Fibre (anag.)" , "Instructions for barrister" , "not lasting long" .)