The most common and most likely answer to this crossword clue is the 10 letter word EFFEMINATE
I've seen this crossword clue in The Times
E
F
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E
M
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More clues leading to the result EFFEMINATE
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The straight part
We know that "camp" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case camp = effeminate.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 EFFEMINATE mean?
EFFEMINATE noun- An effeminate person.
- To make womanly; to unman.
- To become womanly.
- (of a man or boy) Exhibiting behaviour or mannerisms considered typical of a female; unmasculine.
- Womanly; tender, affectionate, caring.