Cryptic crossword clue
Supplementary courses? 11

The most common and most likely answer to this crossword clue is the 11 letter word TRIBUTARIES

I've seen this crossword clue in The Daily Telegraph
T
R
I
B
U
T
A
R
I
E
S

Buddy explains!

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 TRIBUTARIES mean?

TRIBUTARIES noun
  1. A natural water stream that flows into a larger river or other body of water.
  2. A nation, state, or other entity that pays tribute.

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