The most common and most likely answer to this crossword clue is the 7 letter word AMOROSO
I've seen this crossword clue in Financial Times
A
M
O
R
O
S
O
More clues leading to the result AMOROSO
- Ace, endlessly gloomy, has nothing lovingly expressed
- A mostly gloomy outlook primarily for drink
- A married woman, followed by Oscar at separate intervals – that’s sweet
- Tender a mostly severe offer to begin with
- A sherry in the morning? Approximately two, ultimately, downed
- Sherry in a musty room’s old
- Tenderly conveying a love — but almost completely gloomy within
- Excited as room is filled with old sherry
- Sherry is acting sullen, almost odious from the beginning
- Associate gets largely melancholic on old sherry
Buddy explains!

The straight part
We know that "Tender" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tender = amoroso.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 AMOROSO mean?
AMOROSO noun- A male lover.
- Tender; loving