Sculpted penis outside hollow travertine tomb of 3 was made by him (7)
I believe the answer is:
epstein
'tomb of 3 was made by him' is the definition.
The definition suggests a singular noun which matches the answer.
'sculpted penis outside hollow travertine' is the wordplay.
'sculpted' is an anagram indicator (I've seen this in other clues).
'outside' is an insertion indicator (some letters go outside others).
'hollow' means to remove the middle letters (the word is hollowed out).
'travertine' with its middle removed is 'te'.
'penis' is an anagram of 'epsin'.
'epsin' enclosing 'te' is 'EPSTEIN'.
Can you help me to learn more?
(Other definitions for epstein that I've seen before include "old artist" , "produced a few bronzes" , "Sir Jacob --, US-born British sculptor" , "Sir Jacob ..., sculptor noted for his statues of the famous" , "A rock band manager" .)