The most common and most likely answer to this crossword clue is the 3 plus 7 letter word DAY TRIPPER
I've seen this crossword clue in The Daily Telegraph
D
A
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More clues leading to the result DAY TRIPPER
Buddy explains!
The straight part
We know that "Beatles song" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case beatles song = day tripper.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 DAY TRIPPER mean?
DAY TRIPPER noun- Someone who takes a day trip.