The most common and most likely answer to this crossword clue is the 11 letter word ICEBREAKERS
I've seen this crossword clue in The Daily Telegraph
I
C
E
B
R
E
A
K
E
R
S
Buddy explains!
The straight part
We know that "remedies for tension" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case remedies for tension = icebreakers.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 ICEBREAKERS mean?
ICEBREAKERS noun- A ship designed to break through ice so that it, or other ships coming behind, can navigate on frozen seas.
- A game, activity, humorous anecdote, etc., designed to relax a group of people to help them get to know each other.
- A lively song and dance routine at the start of a musical.