The most common and most likely answer to this crossword clue is the 4 letter word WILT
I've seen this crossword clue in The Times
W
I
L
T
More clues leading to the result WILT
- Flag officer on Western Isle
- Output from Sharpe in which lecturer’s almost completely worn down
- Art going to use inspirational Bookends and Bridge over Troubled Water reprise initially
- Will historically wither
- Drop
- Extreme elements in War Department seize the Italian flag
- Old are going to diminish
- Comedian around 50 showing loss of energy
- Sag with one hollow leftist
- Being old, will droop
Buddy explains!

The straight part
We know that "Flag" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flag = wilt.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 WILT mean?
WILT noun- The act of wilting or the state of being wilted.
- Any of various plant diseases characterized by wilting.
- To droop or become limp and flaccid (as a dying leaf or flower).
- To fatigue; to lose strength.
- To cause to droop or become limp and flaccid (as a flower).
- To cause to fatigue; to exhaust.
- (now uncommon or literary) To wish, desire (something).
- (nowadays rare) To wish or desire (that something happen); to intend (that).
- (auxiliary) To habitually do (a given action).
- (auxiliary) To choose to (do something); used to express intention but without any temporal connotations (+ bare infinitive), often in negation.
- (auxiliary) Used to express the future tense, sometimes with some implication of volition when used in the first person. Compare shall.
- (auxiliary) To be able to, to have the capacity to.
- (auxiliary) Expressing a present tense with some conditional or subjective weakening: "will turn out to", "must by inference".
- To wish, desire.
- To instruct (that something be done) in one's will.
- To try to make (something) happen by using one's will (intention).
- To bequeath (something) to someone in one's will (legal document).