The most common and most likely answer to this crossword clue is the 7 letter word TWEENER
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Buddy explains!
The straight part
We know that "Tennis shot" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tennis shot = tweener.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 TWEENER mean?
TWEENER noun- A person who plays at two positions, not good enough at either to be restricted to it.
- A shot that is hit between the legs.
- A tweenager.
- A computing device that is smaller than a traditional laptop, but larger than a PDA.
- A professional wrestler who is neutral or morally ambiguous; neither a face nor a heel, or showing no favoritism to either allegiance.
- A person, machine or piece of software that performs tweening.
- A film that falls between two genres (and thus may not be easily marketed).