Set of shelves that might get Scottish engineer in a tangle, did you say? (7)
I believe the answer is:
whatnot
'set of shelves' is the definition.
(I've seen this before)
'get scottish engineer in a tangle did you say?' is the wordplay.
'get' means one lot of letters go next to another.
'scottish engineer in' becomes 'what' (I can't justify this - if you can you should believe this answer much more).
'a tangle' becomes 'knot' (I've seen this before).
'did you say?' indicates a 'sounds like' (homophone) clue.
'knot' sounds like 'not'.
'what' next to 'not' is 'WHATNOT'.
'that might' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for whatnot that I've seen before include "Thing whose name is temporarily forgotten" , "Portable stand with shelves" , "This piece of furniture" , "Shelved stand for ornaments" , "Thingumajig" .)