The most common and most likely answer to this crossword clue is the 11 letter word PROGRESSION
I've seen this crossword clue in The Daily Telegraph
P
R
O
G
R
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S
S
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N
More clues leading to the result PROGRESSION
Buddy explains!
The straight part
We know that "Forward motion" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case forward motion = progression.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 PROGRESSION mean?
PROGRESSION noun- The act of moving from one thing to another.
- The act of moving forward or proceeding in a course; motion onward.
- A sequence obtained by adding or multiplying each term by a constant.
- Development, increase, evolution.
- Chord progression
- (exercise) The making an exercise more exerting by manipulating the details of its performance like loaded weight, range of motion, angle, speed.