Crossword Genius

Express carrying goods far from firm (5)

Ross

I believe the answer is:

saggy

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'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" .)

I've seen this clue in The Times.
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