The most common and most likely answer to this crossword clue is the 5 plus 2 plus 1 plus 7 letter word LIGHT AS A FEATHER
I've seen this crossword clue in The Times
L
I
G
H
T
A
S
A
F
E
A
T
H
E
R
Buddy explains!
The straight part
We know that "easy to transport" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case easy to transport = light as a feather.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.