Crossword Genius

Vulcan, say, heading for metal heap? I'm amazed about it (8)

Ross

I believe the answer is:

compiler

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

'vulcan' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

'heading for metal heap? i'm amazed about it' is the wordplay.
I cannot quite see how this works, but
'metal' could be 'er' (Er is an example) and 'er' is located in the answer.
'i'm' could be 'i' (I've seen this in other clues) and 'i' is found within the answer.
'about' could be 'c' (circa) and 'c' is found in the answer.
This explanation may well be incorrect...

'say' acts as a link.

Can you help me to learn more?

(Other definitions for compiler that I've seen before include "Writer of document" , "program" , "Author of puzzles, perhaps" , "setter" , "Person who puts together information" .)

I've seen this clue in The Guardian.
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