Erector (7)
I believe the answer is:
builder
'erector' is the definition.
(I have seen 'Erector of houses ' mean 'builder' so perhaps 'erector' could also mean 'builder')
This is all the clue.
(Other definitions for builder that I've seen before include "Constructor" , "Bob, eg" , "Erector of houses" , "Bob the - - (TV)" , "One involved in construction" .)