The most common and most likely answer to this crossword clue is the 10 letter word CURRENCIES
I've seen this crossword clue in The Guardian
C
U
R
R
E
N
C
I
E
S
More clues leading to the result CURRENCIES
Buddy explains!

The straight part
We know that "Many a tender" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case many a tender = currencies.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 CURRENCIES mean?
CURRENCIES noun- Money or other items used to facilitate transactions.
- (more specifically) Paper money.
- The state of being current; general acceptance or recognition.
- Current value; general estimation; the rate at which anything is generally valued.
- Fluency; readiness of utterance