Finally Aldi marketed the French loaf (4)
I believe the answer is:
idle
'loaf' is the definition.
(I've seen this in another clue)
'finally aldi marketed the french' is the wordplay.
'finally' suggests the final letters.
'the french' becomes 'le' ('the' in French).
The final letters of 'aldi marketed' are 'id'.
'id'+'le'='IDLE'
(Other definitions for idle that I've seen before include "loiter aimlessly" , "without basis" , "-- Jack, pantomime character" , "Lazy, doing nothing" , "Do nothing, laze" .)