The most common and most likely answer to this crossword clue is the 11 letter word FLAT-FOOTED
I've seen this crossword clue in Financial Times
F
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More clues leading to the result FLAT-FOOTED
Buddy explains!
The straight part
We know that "Unimaginative" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unimaginative = flat-footed.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 FLAT-FOOTED mean?
FLAT-FOOTED adjective- Having feet which are flat.
- (of humans) Having the specific physical condition of flat feet.
- Holding firmly and maintaining a decision; standing one's ground.
- Blunt and unsubtle; lacking finesse.
- Unprepared to act.
- To walk around in the course of work, especially when investigating.
- To dance in the style of Appalachian clogging.
- To gulp an entire drink (bottle, glass, can, etc.) without pausing between swallows.
- To perform an action inefficiently or awkwardly.
- To wrongfoot.