Cryptic crossword clue
Foe messed with lieutenant’s head, TV ace making U-turn 5-4

The most common and most likely answer to this crossword clue is the 10 letter word VOLTE-FACE

I've seen this crossword clue in The Guardian
V
O
L
T
E
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F
A
C
E


Buddy explains!

The straight part
We know that "U-turn" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case u-turn = volte-face.
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 VOLTE-FACE mean?

VOLTE-FACE noun
  1. A reversal of policy, attitude or principle.

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