The most common and most likely answer to this crossword clue is the 5 letter word TIDAL
T
I
D
A
L
More clues leading to the result TIDAL
- Boy with it turns, following effect of the moon?
- Following ocean currents, it turned and boy turned
- Partly glad I thought about such a wave
- Boy with appeal on the rise, going with the flow
- Rising and falling, boy wants it back
- I had featured in short talk relating to sea level changes
- Third ball struck regularly, moving due to gravity
- Like some waters initially lapping mine entrance when rising
- Boy having sex standing up, going in and out?
- Going back and forth, virtually unlikely to retain passport
Buddy explains!

The straight part
We know that "moving due to gravity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case moving due to gravity = tidal.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 TIDAL mean?
TIDAL adjective- Relating to tides