Cryptic crossword clue
Boy and friend going under water at a certain time of the year 10

The most common and most likely answer to this crossword clue is the 10 letter word SEASONALLY

I've seen this crossword clue in The Daily Telegraph
S
E
A
S
O
N
A
L
L
Y


Buddy explains!

The straight part
We know that "at a certain time of the year" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case at a certain time of the year = seasonally.
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 SEASONALLY mean?

SEASONALLY adverb
  1. Occurring every season.
  2. Occurring only in season.

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