The most common and most likely answer to this crossword clue is the 8 letter word NACELLES
N
A
C
E
L
L
E
S
Buddy explains!

The straight part
We know that "Engine housings" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case engine housings = nacelles.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 NACELLES mean?
NACELLES noun- A separate streamlined enclosure mounted on an aircraft to house an engine, cargo, or crew.
- The part between the tower and rotor of a wind turbine.
- The compartment that holds passengers on a hot-air balloon, a dirigible, or an aerostat; a gondola.
- The submersed providers of buoyancy of a SWATH hulled boat.
- A small boat.