Crossword Genius

If you want it mined, ring the engineers! (3)

Ross

I believe the answer is:

ore

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

'if you want it mined' is the definition.
I can't tell whether this defines the answer.

'ring the engineers' is the wordplay.
'ring' becomes 'o' (letter resembling a ring).
'the engineers' becomes 're' (Royal Engineers).
'o'+'re'='ORE'

Can you help me to learn more?

(Other definitions for ore that I've seen before include "Raw mineral" , "Raw material" , "Mineral - Scandinavian monetary unit" , "Mineral - Scandinavian money" , "Solid rock containing metal" .)

I've seen this clue in the Evening Standard.
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