The most common and most likely answer to this crossword clue is the 7 letter word WILDCAT
I've seen this crossword clue in The Daily Telegraph
W
I
L
D
C
A
T
More clues leading to the result WILDCAT
- WC with tidal waves? Commercially risky!
- With tidal variation around Cape and exploratory oil well
- Predatory type not approved by union
- Animal that might give act?
- Comic in middle of cold call; reversing that is unauthorised
- Kind of action outside trade organisation. Jaguar, maybe?
- Act strangely when suddenly striking
- Unofficial act we might deduce?
- Strikingly unauthorised act, perhaps?
- Striking beast?
Buddy explains!

The straight part
We know that "Jaguar, maybe?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case jaguar, maybe? = wildcat.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 WILDCAT mean?
WILDCAT noun- A cat that lives in the wilderness, specifically
- A person who acts like a wildcat, (usually) a violent and easily-angered person or a sexually vigorous one.
- An offensive formation with an unbalanced line and a snap directly to the running back rather than the quarterback.
- A wheel that can be adjusted so as to revolve either with or on the shaft of a capstan.
- Clipping of wildcat money, notes issued by a wildcat bank.
- To drill for oil in an area where no oil has been found before.
- (usually derogatory) Of or concerning businesses operating outside standard or legitimate practice, especially:
- Of or concerning customized or hand-made cartridges.
- Unauthorized by the proper authorities.
- A cartridge modified from another calibre rather than being commercially produced.
- (organized labour) A labour strike that has not been authorized by the leaders of a trade union.