The most common and most likely answer to this crossword clue is the 7 letter word BUILDER
I've seen this crossword clue in The Times
B
U
I
L
D
E
R
Buddy explains!
The straight part
We know that "Bob, eg" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bob, eg = builder.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does BUILDER mean?
BUILDER noun- A person who builds or constructs things.
- Master artisan, who receives his instructions from the architect, and employs workers.
- A bodybuilder.