Scientist forced to lie long ago: no good coming out of that (7)
I believe the answer is:
galileo
'scientist' is the definition.
(I've seen this before)
'forced to lie long ago no good coming out of that' is the wordplay.
I cannot quite see how this works, but
an anagram of 'lie' is 'ile' which is within the answer.
'long' could be 'l' and 'l' is located in the answer.
an anagram of 'ago' is 'gao' which is within the left over letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for galileo that I've seen before include "Italian astronomer and mathematician, d. 1642" , "Astronomer - ogle Ali (anag)" , "victim of Inquisition" , "Famous Italian" , "US unmanned space-craft launched in 1989 to investigate Jupiter" .)