The most common and most likely answer to this crossword clue is the 8 letter word SIDEWAYS
I've seen this crossword clue in The Times
S
I
D
E
W
A
Y
S
More clues leading to the result SIDEWAYS
- Team methods not progressive
- Team considers talking obliquely
- Method that separates teams not straightforward
- Fish-wife always fills empty shells as crabs go
- Very surprised how one can be knocked
- Indirectly influences catching fish
- Comments one drops in obliquely
- Rules about fish in byroads?
- Go indirectly by perimeter roads
- How crabs move, and fish among rocks
Buddy explains!

The straight part
We know that "not progressive" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not progressive = sideways.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 SIDEWAYS mean?
SIDEWAYS noun- A footpath near a road.
- A byway.
- Moving or directed toward one side.
- Positioned sideways (with a side to the front).
- Neither moving upward nor moving downward.
- Not as planned; towards a worse outcome.
- (usually with "with") In conflict (with); not compatible (with).
- With a side to the front.
- Towards one side.
- Askance; sidelong.
- Neither upward nor downward.