The most common and most likely answer to this crossword clue is the 10 letter word MACKINTOSH
I've seen this crossword clue in Independent
M
A
C
K
I
N
T
O
S
H
More clues leading to the result MACKINTOSH
- Architect Charlie enters, generating endless rubbish
- Designer label in top and rubbish coat
- Top bunk lined with Calvin Klein coat
- Cover for an art-nouveau designer
- Waterproof mink coat found in jumble, small hole at the front
- Scottish architect‘s protection against cats and dogs?
- Cover provided for Scottish furniture designer
- Architect who’s off a month sick
- . Mocha stink obscured by raincoat
Buddy explains!

The straight part
We know that "Architect" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case architect = mackintosh.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 MACKINTOSH mean?
MACKINTOSH noun- A waterproof long coat made of rubberized cloth.
- By extension, any waterproof coat or raincoat.
- Waterproof rubberized cloth.