The most common and most likely answer to this crossword clue is the 5 letter word LICIT
I've seen this crossword clue in Financial Times
L
I
C
I
T
More clues leading to the result LICIT
- With permission, starts to live in city in Thailand
- Landed outside tax haven zone, not against the law
- Drunk crossing Channel Islands? It’s legal
- A bit flipping erotic? Ill-advisably, not forbidden
- Legitimate request? Not so
- Permissible but to some extent duplicitous
- Felicity’s content, not being banned
- Parasites’ endless sex is warranted
- Legal officer’s trapped here in France
- Allowed tenfold reduction in restriction at centre?
Buddy explains!

The straight part
We know that "Legitimate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case legitimate = licit.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 LICIT mean?
LICIT adjective- Not forbidden by formal or informal rules.
- Explicitly established or constituted by law.