Express carrying goods far from firm (5)
I believe the answer is:
saggy
'far from firm' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'express carrying goods' is the wordplay.
'express' becomes 'say' (saying is a kind of expressing).
'carrying' is an insertion indicator.
'goods' becomes 'gg' (g is abbreviation for good - twice).
'say' placed around 'gg' is 'SAGGY'.
Can you help me to learn more?
(Other definitions for saggy that I've seen before include "Hanging down" , "Drooping" .)