The most common and most likely answer to this crossword clue is the 8 letter word DRIVABLE
I've seen this crossword clue in The Times
D
R
I
V
A
B
L
E
Buddy explains!
The straight part
We know that "ok for a steer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ok for a steer = drivable.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 DRIVABLE mean?
DRIVABLE adjective- Capable of being driven (as a vehicle).
- Capable of being driven on safely or successfully (as a road or other surface).