Cryptic crossword clue
Lira — foreign currency in Guiana circulating as means of exchange 6,6

The most common and most likely answer to this crossword clue is the 13 letter word LINGUA FRANCA

I've seen this crossword clue in The Guardian
L
I
N
G
U
A
Â
 
F
R
A
N
C
A

Buddy explains!

The straight part
We know that "means of exchange" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case means of exchange = lingua franca.
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.

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