The most common and most likely answer to this crossword clue is the 6 letter word PUTLOG
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More clues leading to the result PUTLOG
Buddy explains!

The straight part
We know that "part of scaffolding" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case part of scaffolding = putlog.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 PUTLOG mean?
PUTLOG noun- One of the short pieces of timber on which the planks forming the floor of a scaffold are laid, one end resting on the ledger of the scaffold, and the other in a hole left in the wall temporarily for the purpose.