Crossword Genius

Extremely rough gang shifting ring and diamond (5)

Ross

I believe the answer is:

rhomb

I'm a little stuck... Click here to teach me more about this clue!

'diamond' is the definition.
(I know that diamond can be written as rhomb)

'extremely rough gang shifting ring' is the wordplay.
'extremely rough' becomes 'rho' (I can't explain this - if you can you should give a lot more credence to this answer).
'gang' becomes 'mob' (synonyms).
'shifting' indicates named letters should be taken away.
'ring' becomes 'O' (letter resembling a ring).
'mob' with 'o' taken out is 'mb'.
'rho'+'mb'='RHOMB'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for rhomb that I've seen before include "Equilateral parallelogram" , "Lozenge" , "Crystal shape" , "Figure on plane" , "Crystal with six faces having parallel edges" .)

I've seen this clue in The Independent.
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