Crossword Genius

Press old engineers to show where metal comes from (4,3)

Ross

I believe the answer is:

iron ore

'where metal comes from' is the definition.
(an iron ore contains iron)

'press old engineers' is the wordplay.
'press' becomes 'iron' (ironing is a kind of pressing).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'engineers' becomes 're' (abbreviation for Royal Engineers).
'iron'+'o'+'re'='IRON-ORE'

'to show' acts as a link.

(Other definitions for iron ore that I've seen before include "Mineral yielding common metal" , "From which a particular metal may be extracted" , "Aggregate from which the metal Fe can be extracted" , "Rock from which a metal can be extracted" , "Nero or I (anag) -- from which a common metal comes" .)

I've seen this clue in The Telegraph.
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