The most common and most likely answer to this crossword clue is the 6 letter word TARZAN
I've seen this crossword clue in Financial Times
T
A
R
Z
A
N
More clues leading to the result TARZAN
- Seaman, mostly crazy, legendary strong man
- Movie star, zany – sides splitting
- Viscount Greystoke spotted in Gibraltar and Zanzibar
- Jane’s swinging partner?
- Uncivilised person taking salt with nuts mostly
- Jungle inhabitant‘s extremities seen over in lake
- Comic-book hero knocking over short fascist vermin
- Rant wildly about South Africa’s feral child brought up by apes
Buddy explains!
The straight part
We know that "Jane’s swinging partner" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case jane’s swinging partner = tarzan.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.