The most common and most likely answer to this crossword clue is the 6 plus 3 plus 5 letter word APPLES AND PEARS
I've seen this crossword clue in The Times
A
P
P
L
E
S
A
N
D
P
E
A
R
S
More clues leading to the result APPLES AND PEARS
- Flight software the French put round Polish Conference?
- A flight to East London?
- Sad paper planes crash in flight
- Passenger initially spared as plane crashed in flight from East London
- Ned, joining pals assembling inside, looks for stairs in east London
- The approach to landing in London?
- Fruitful flight for 6?
- Flights from London in planes appear dubious for vacation, unfortunately
- Arsenal players finally papped tearing up stairs
Buddy explains!

The straight part
We know that "A flight to East London" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a flight to east london = apples and pears.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.