The most common and most likely answer to this crossword clue is the 8 letter word CRUISING
I've seen this crossword clue in Financial Times
C
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More clues leading to the result CRUISING
Buddy explains!
The straight part
We know that "motoring slowly while on lookout" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case motoring slowly while on lookout = cruising.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 CRUISING mean?
CRUISING verb- To sail about, especially for pleasure.
- To travel at constant speed for maximum operating efficiency.
- To move about an area leisurely in the hope of discovering something, or looking for custom.
- To inspect (forest land) for the purpose of estimating the quantity of lumber it will yield.
- To actively seek a romantic partner or casual sexual partner by moving about a particular area; to troll.
- (child development) To walk while holding on to an object (stage in development of ambulation, typically occurring at 10 months).
- To win easily and convincingly.
- Sailing about without an exact destination, usually for pleasure.
- Walking or driving about a locality in search of a casual sex partner, especially among gay males.