Don't struggle to get the meaning (5)
I believe the answer is:
drift
'the meaning' is the definition.
(drift is a kind of meaning)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for drift that I've seen before include "Travel without purpose" , "Gist - snow" , "aimless" , "Trend; meaning" , "General meaning or flow" .)