Mike shot porn, ultimately, to get filthy lucre (6)
I believe the answer is:
mammon
'filthy lucre' is the definition.
(term for the evil influence of wealth)
'mike shot porn ultimately' is the wordplay.
'mike' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'shot' becomes 'ammo' (ammunition).
'ultimately' indicates one should take the final letters.
The final letter of 'porn' is 'n'.
'm'+'ammo'+'n'='MAMMON'
'to get' acts as a link.
(Other definitions for mammon that I've seen before include "God of material wealth" , "Wealth as an object of worship" , "Biblical god of riches" , "Wealth personified, you cannot serve God an . . . . . ." , "money" .)