Pacino look back over Muhammad making soluble mineral salt (6)

I believe the answer is:

alkali

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'soluble mineral salt' is the definition.
'alkali' can be an answer for 'salt' (alkali is a kind of salt). I am not certain of the 'soluble mineral' bit.

'pacino look back over muhammad' is the wordplay.
'pacino' becomes 'al' (Al Pacino).
'back' suggests the final letters.
'over muhammad' becomes 'ali' (I can't explain this - if you can you should believe this answer much more).
The final letter of 'look' is 'k'.
'al'+'k'+'ali'='ALKALI'

'making' is the link.

Can you help me to learn more?

(Other definitions for alkali that I've seen before include "Substance turning litmus paper blue" , "Salt" , "Chemical base" , "Acid-neutralising substance" , "Compound like lime" .)

I've seen this clue in the Sydney Morning Herald.

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